UpHeron
All vulnerabilities

Servers and applications

CVE-2021-34791

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,…

Severity
Medium 5.3
Published
27 Oct 2021
Last changed
11 Aug 2026
Added to UpHeron
1 Nov 2026
Fixed in
9.8.4.40, 9.12.4.18, 9.14.2.15, 9.15.1.15
Sources
NVD

Affected software

SoftwareAffected versions
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:a:cisco:adaptive_security_appliance
  • Every version before 9.8.4.40
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:o:cisco:adaptive_security_appliance_software
  • From 9.12.0 before 9.12.4.18
  • From 9.13.0 before 9.14.2.15
  • From 9.15.0 before 9.15.1.15

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-34791
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-34791