CVEs Actively Exploited
Summary
This joint Cybersecurity Advisory (CSA) provides the top Common Vulnerabilities and Exposures (CVEs) used since 2020 by People’s Republic of China (PRC) state-sponsored cyber actors as assessed by the National Security Agency (NSA), Cybersecurity and Infrastructure Security Agency (CISA), and Federal Bureau of Investigation (FBI). PRC state-sponsored cyber actors continue to exploit known vulnerabilities to actively target U.S. and allied networks as well as software and hardware companies to steal intellectual property and develop access into sensitive networks.
This joint CSA builds on previous NSA, CISA, and FBI reporting to inform federal and state, local, tribal and territorial (SLTT) government; critical infrastructure, including the Defense Industrial Base Sector; and private sector organizations about notable trends and persistent tactics, techniques, and procedures (TTPs).
NSA, CISA, and FBI urge U.S. and allied governments, critical infrastructure, and private sector organizations to apply the recommendations listed in the Mitigations section and Appendix A to increase their defensive posture and reduce the threat of compromise from PRC state-sponsored malicious cyber actors.
For more information on PRC state-sponsored malicious cyber activity, see CISA’s China Cyber Threat Overview and Advisories webpage, FBI’s Industry Alerts, and NSA’s Cybersecurity Advisories & Guidance.
Download the PDF version of this report: pdf, 409 KB
Technical Details
NSA, CISA, and FBI continue to assess PRC state-sponsored cyber activities as being one of the largest and most dynamic threats to U.S. government and civilian networks. PRC state-sponsored cyber actors continue to target government and critical infrastructure networks with an increasing array of new and adaptive techniques—some of which pose a significant risk to Information Technology Sector organizations (including telecommunications providers), Defense Industrial Base (DIB) Sector organizations, and other critical infrastructure organizations.
PRC state-sponsored cyber actors continue to exploit known vulnerabilities and use publicly available tools to target networks of interest. NSA, CISA, and FBI assess PRC state-sponsored cyber actors have actively targeted U.S. and allied networks as well as software and hardware companies to steal intellectual property and develop access into sensitive networks. See Table 1 for the top used CVEs.
Table I: Top CVEs most used by Chinese state-sponsored cyber actors since 2020
|
Vendor |
CVE |
Vulnerability Type |
|
Apache Log4j |
CVE-2021-44228 |
Remote Code Execution |
|
Pulse Connect Secure |
CVE-2019-11510 |
Arbitrary File Read |
|
GitLab CE/EE |
CVE-2021-22205 |
Remote Code Execution |
|
Atlassian |
CVE-2022-26134 |
Remote Code Execution |
|
Microsoft Exchange |
CVE-2021-26855 |
Remote Code Execution |
|
F5 Big-IP |
CVE-2020-5902 |
Remote Code Execution |
|
VMware vCenter Server |
CVE-2021-22005 |
Arbitrary File Upload |
|
Citrix ADC |
CVE-2019-19781 |
Path Traversal |
|
Cisco Hyperflex |
CVE-2021-1497 |
Command Line Execution |
|
Buffalo WSR |
CVE-2021-20090 |
Relative Path Traversal |
|
Atlassian Confluence Server and Data Center |
CVE-2021-26084 |
Remote Code Execution |
|
Hikvision Webserver |
CVE-2021-36260 |
Command Injection |
|
Sitecore XP |
CVE-2021-42237 |
Remote Code Execution |
|
F5 Big-IP |
CVE-2022-1388 |
Remote Code Execution |
|
Apache |
CVE-2022-24112 |
Authentication Bypass by Spoofing |
|
ZOHO |
CVE-2021-40539 |
Remote Code Execution |
|
Microsoft |
CVE-2021-26857 |
Remote Code Execution |
|
Microsoft |
CVE-2021-26858 |
Remote Code Execution |
|
Microsoft |
CVE-2021-27065 |
Remote Code Execution |
|
Apache HTTP Server |
CVE-2021-41773 |
Path Traversal |
These state-sponsored actors continue to use virtual private networks (VPNs) to obfuscate their activities and target web-facing applications to establish initial access. Many of the CVEs indicated in Table 1 allow the actors to surreptitiously gain unauthorized access into sensitive networks, after which they seek to establish persistence and move laterally to other internally connected networks. For additional information on PRC state-sponsored cyber actors targeting network devices, please see People’s Republic of China State-Sponsored Cyber Actors Exploit Network Providers and Devices.
Mitigations
NSA, CISA, and FBI urge organizations to apply the recommendations below and those listed in Appendix A.
- Update and patch systems as soon as possible. Prioritize patching vulnerabilities identified in this CSA and other known exploited vulnerabilities.
- Utilize phishing-resistant multi-factor authentication whenever possible. Require all accounts with password logins to have strong, unique passwords, and change passwords immediately if there are indications that a password may have been compromised.
- Block obsolete or unused protocols at the network edge.
- Upgrade or replace end-of-life devices.
- Move toward the Zero Trust security model.
- Enable robust logging of Internet-facing systems and monitor the logs for anomalous activity.
Appendix A
Table II: Apache CVE-2021-44228
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Apache CVE-2021-44228 CVSS 3.0: 10 (Critical) |
|
Vulnerability Description Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against malicious actor controlled LDAP and other JNDI related endpoints. A malicious actor who can control log messages or log message parameters could execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects. |
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Recommended Mitigations
|
|
Detection Methods |
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Vulnerable Technologies and Versions There are numerous vulnerable technologies and versions associated with CVE-2021-44228. For a full list, check https://nvd.nist.gov/vuln/detail/CVE-2021-44228. |
Table III: Pulse CVE-2019-11510
|
Pulse CVE-2019-11510 CVSS 3.0: 10 (Critical) |
|
Vulnerability Description This vulnerability has been modified since it was last analyzed by NVD. It is awaiting reanalysis, which may result in further changes to the information provided. In Pulse Secure Pulse Connect Secure (PCS) 8.2 before 8.2R12.1, 8.3 before 8.3R7.1, and 9.0 before 9.0R3.4, an unauthenticated remote malicious actor could send a specially crafted URI to perform an arbitrary file reading vulnerability. |
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Recommended Mitigations
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Detection Methods
|
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Vulnerable Technologies and Versions Pulse Connect Secure (PCS) 8.2 before 8.2R12.1, 8.3 before 8.3R7.1, and 9.0 before 9.0R3.4 |
Table IV: GitLab CVE-2021-22205
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GitLab CVE-2021-22205 CVSS 3.0: 10 (Critical) |
|
Vulnerability Description An issue has been discovered in GitLab CE/EE affecting all versions starting from 11.9. GitLab was not properly validating image files passed to a file parser, which resulted in a remote command execution. |
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Recommended Mitigations
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Detection Methods
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Vulnerable Technologies and Versions Gitlab CE/EE. |
Table V: Atlassian CVE-2022-26134
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Atlassian CVE-2022-26134 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that could allow an unauthenticated malicious actor to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are from 1.3.0 before 7.4.17, 7.13.0 before 7.13.7, 7.14.0 before 7.14.3, 7.15.0 before 7.15.2, 7.16.0 before 7.16.4, 7.17.0 before 7.17.4, and 7.18.0 before 7.18.1. |
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Recommended Mitigations
|
|
Detection Methods N/A |
|
Vulnerable Technologies and Versions All supported versions of Confluence Server and Data Center Confluence Server and Data Center versions after 1.3.0 |
Table VI: Microsoft CVE-2021-26855
|
Microsoft CVE-2021-26855 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description Microsoft has released security updates for Windows Exchange Server. To exploit these vulnerabilities, an authenticated malicious actor could send malicious requests to an affected server. A malicious actor who successfully exploited these vulnerabilities would execute arbitrary code and compromise the affected systems. If successfully exploited, these vulnerabilities could allow an adversary to obtain access to sensitive information, bypass security restrictions, cause a denial of service conditions, and/or perform unauthorized actions on the affected Exchange server, which could aid in further malicious activity. |
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Recommended Mitigations
|
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Detection Methods
|
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Vulnerable Technologies and Versions Microsoft Exchange 2013, 2016, and 2019. |
Table VII: F5 CVE-2020-5902
Table VIII: VMware CVE-2021-22005
|
VMware CVE-2021-22005 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description The vCenter Server contains an arbitrary file upload vulnerability in the Analytics service. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to execute code on vCenter Server by uploading a specially crafted file. |
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Recommended Mitigations |
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Detection Methods N/A |
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Vulnerable Technologies and Versions VMware Cloud Foundation VMware VCenter Server |
Table IX: Citrix CVE-2019-19781
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Citrix CVE-2019-19781 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description This vulnerability has been modified since it was last analyzed by NVD. It is awaiting reanalysis, which may result in further changes to the information provided. An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. They allow Directory Traversal. |
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Recommended Mitigations |
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Detection Methods N/A |
|
Vulnerable Technologies and Versions Citrix ADC, Gateway, and SD-WAN WANOP |
Table X: Cisco CVE-2021-1497
|
Cisco CVE-2021-1497 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description Multiple vulnerabilities in the web-based management interface of Cisco HyperFlex HX could allow an unauthenticated, remote malicious actor to perform a command injection against an affected device. For more information about these vulnerabilities, see the Technical details section of this advisory. |
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Recommended Mitigations
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Detection Methods
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Vulnerable Technologies and Versions Cisco Hyperflex Hx Data Platform 4.0(2A) |
Table XI: Buffalo CVE-2021-20090
|
Buffalo CVE-2021-20090 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote malicious actors to bypass authentication. |
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Recommended Mitigations
|
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Detection Methods |
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Vulnerable Technologies and Versions Buffalo Wsr-2533Dhpl2-Bk Firmware Buffalo Wsr-2533Dhp3-Bk Firmware |
Table XII: Atlassian CVE-2021-26084
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Atlassian CVE-2021-26084 CVSS 3.0: 9.8 (Critical) |
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Vulnerability Description In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated malicious actor to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23 and from version 6.14.0 before 7.4.11, version 7.5.0 before 7.11.6, and version 7.12.0 before 7.12.5. |
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Recommended Mitigations
|
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Detection Methods N/A |
|
Vulnerable Technologies and Versions Atlassian Confluence Atlassian Confluence Server Atlassian Data Center Atlassian Jira Data Center |
Table XIII: Hikvision CVE-2021-36260
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Hikvision CVE-2021-36260 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description This vulnerability has been modified since it was last analyzed by NVD. It is awaiting reanalysis, which may result in further changes to the information provided. A command injection vulnerability exists in the web server of some Hikvision products. Due to the insufficient input validation, a malicious actor can exploit the vulnerability to launch a command injection by sending some messages with malicious commands. |
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Recommended Mitigations
|
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Detection Methods N/A |
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Vulnerable Technologies and Versions Various Hikvision Firmware to include Ds, Ids, and Ptz |
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References |
Table XIV: Sitecore CVE-2021-42237
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Sitecore CVE-2021-42237 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability. |
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Recommended Mitigations
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Detection Methods |
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Vulnerable Technologies and Versions Sitecore Experience Platform 7.5, 7.5 Update 1, and 7.5 Update 2 Sitecore Experience Platform 8.0, 8.0 Service Pack 1, and 8.0 Update 1-Update 7 Sitecore Experience Platform 8.0 Service Pack 1 Sitecore Experience Platform 8.1, and Update 1-Update 3 Sitecore Experience Platform 8.2, and Update 1-Update 7 |
Table XV: F5 CVE-2022-1388
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F5 CVE-2022-1388 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description This vulnerability has been modified since it was last analyzed by NVD. It is awaiting reanalysis, which may result in further changes to the information provided. On F5 BIG-IP 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5.1, 14.1.x versions prior to 14.1.4.6, 13.1.x versions prior to 13.1.5, and all 12.1.x and 11.6.x versions, undisclosed requests may bypass iControl REST authentication. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. |
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Recommended Mitigations
|
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Detection Methods N/A |
|
Vulnerable Technologies and Versions Big IP versions: 16.1.0-16.1.2 15.1.0-15.1.5 14.1.0-14.1.4 13.1.0-13.1.4 12.1.0-12.1.6 11.6.1-11.6.5 |
Table XVI: Apache CVE-2022-24112
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Apache CVE-2022-24112 CVSS 3.0: 9.8 (Critical) |
|
Vulnerability Description A malicious actor can abuse the batch-requests plugin to send requests to bypass the IP restriction of Admin API. A default configuration of Apache APISIX (with default API key) is vulnerable to remote code execution. When the admin key was changed or the port of Admin API was changed to a port different from the data panel, the impact is lower. But there is still a risk to bypass the IP restriction of Apache APISIX’s data panel. There is a check in the batch-requests plugin which overrides the client IP with its real remote IP. But due to a bug in the code, this check can be bypassed. |
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Recommended Mitigations
|
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Detection Methods N/A |
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Vulnerable Technologies and Versions Apache APISIX between 1.3 and 2.12.1 (excluding 2.12.1) LTS versions of Apache APISIX between 2.10.0 and 2.10.4 |
Table XVII: ZOHO CVE-2021-40539
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ZOHO CVE-2021-40539 CVSS 3.0: 9.8 (Critical) |
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Vulnerability Description Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution. |
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Recommended Mitigations
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Detection Methods
|
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Vulnerable Technologies and Versions Zoho Corp ManageEngine ADSelfService Plus |
Table XVIII: Microsoft CVE-2021-26857
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Microsoft CVE-2021-26857 CVSS 3.0: 7.8 (High) |
|
Vulnerability Description Microsoft Exchange Server remote code execution vulnerability. This CVE ID differs from CVE-2021-26412, CVE-2021-26854, CVE-2021-26855, CVE-2021-26858, CVE-2021-27065, and CVE-2021-27078. |
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Recommended Mitigations
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Detection Methods
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Vulnerable Technologies and Versions Microsoft Exchange Servers |
Table XIX: Microsoft CVE-2021-26858
Table XX: Microsoft CVE-2021-27065
Table XXI: Apache CVE-2021-41773
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Apache CVE-2021-41773 CVSS 3.0: 7.5 (High) |
|
Vulnerability Description This vulnerability has been modified since it was last analyzed by NVD. It is awaiting reanalysis, which may result in further changes to the information provided. A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. A malicious actor could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration “require all denied,” these requests can succeed. Enabling CGI scripts for these aliased paths could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 is incomplete (see CVE-2021-42013). |
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Recommended Mitigations |
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Detection Methods
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Vulnerable Technologies and Versions Apache HTTP Server 2.4.49 and 2.4.50 Fedoraproject Fedora 34 and 35 Oracle Instantis Enterprise Track 17.1-17.3 Netapp Cloud Backup |
Revisions
Initial Publication: October 6, 2022
