UpHeron
All vulnerabilities

Servers and applications

CVE-2021-34783

A vulnerability in the software-based SSL/TLS message handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient validation of SSL/TLS messages when the device performs…

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, 9.12.4.29, 9.14.3.9, 9.15.1.17, 9.16.2
Sources
NVD

Affected software

SoftwareAffected versions
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:o:cisco:adaptive_security_appliance_software
  • From 9.8.0 before 9.8.4.40
  • From 9.12.0 before 9.12.4.29
  • From 9.14.0 before 9.14.3.9
  • From 9.15.0 before 9.15.1.17
  • From 9.16.0 before 9.16.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-34783
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-34783