CVE-2021-34791
4.7 · MEDIUMOverview
CVE-2021-34791 is a medium-severity vulnerability affecting cisco adaptive_security_appliance. It was published on October 27, 2021 and has a CVSS 3.1 base score of 4.7 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host located behind the ALG. For more information about these vulnerabilities, see the Details section of this advisory. Note: These vulnerabilities have been publicly discussed as NAT Slipstreaming.
Remediation
Check the references section for vendor advisories and patches from cisco. Update adaptive_security_appliance to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| cisco | adaptive_security_appliance | >= 0, < 9.8.4.40 | Affected |
| cisco | secure_firewall_threat_defense | >= 0, < 6.4.0.12 | Affected |
| cisco | adaptive_security_appliance_software | >= 9.12.0, < 9.12.4.18 | Affected |
Frequently Asked Questions
What is CVE-2021-34791?
CVE-2021-34791 is a medium-severity vulnerability affecting cisco adaptive_security_appliance. It was published on October 27, 2021 and has a CVSS 3.1 base score of 4.7 (MEDIUM).
How severe is CVE-2021-34791?
This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-34791?
Check the references section for vendor advisories and patches from cisco. Update adaptive_security_appliance to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-34791?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-34791 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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