Buffer overflow in Cisco Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2021-34783

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Main Vulnerability Database Vulnerabilities #VU57798

Buffer overflow in Cisco Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2021-34783

Published: October 29, 2021


Vulnerability identifier: #VU57798
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34783
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the software-based SSL/TLS message handler. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.


Affected software

Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)

How to mitigate CVE-2021-34783

Install updates from vendor's website.

Cisco Firewall Threat Defense (FTD) - addressed in versions 6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1
Cisco Adaptive Security Appliance (ASA) - update to 9.16.2

External References

Related Security Bulletins