UpHeron
All vulnerabilities

Servers and applications

CVE-2021-40117

A vulnerability in SSL/TLS message handler for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because incoming SSL/TLS packets are not properly processed. An attacker could exploit this vulnerability by…

Severity
High 7.5
Published
27 Oct 2021
Last changed
11 Aug 2026
Added to UpHeron
1 Nov 2026
Fixed in
9.8.4.40, 9.12.4.26, 9.14.3.9, 9.15.1.17, 9.16.2.3
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 9.9.0 before 9.12.4.26
  • From 9.13.0 before 9.14.3.9
  • From 9.15.0 before 9.15.1.17
  • From 9.16.0 before 9.16.2.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-40117
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-40117