Improper Handling of Unexpected Data Type in Cisco Firewall Threat Defense (FTD) and Snort - CVE-2021-40116

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Main Vulnerability Database Vulnerabilities #VU57800

Improper Handling of Unexpected Data Type in Cisco Firewall Threat Defense (FTD) and Snort - CVE-2021-40116

Published: October 29, 2021


Vulnerability identifier: #VU57800
CSH Severity: High
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-2021-40116
CWE-ID: CWE-241
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 improper handling of the Block with Reset or Interactive Block with Reset actions if a rule is configured without proper constraints. A remote attacker can send a specially crafted IP packet and perform a denial of service (DoS) attack.


Affected software

Cisco Firewall Threat Defense (FTD)
Snort

How to mitigate CVE-2021-40116

Install update from vendor's website.

Cisco Firewall Threat Defense (FTD) - update to 7.0.1
Snort - update to 3.1.0.100

External References

Related Security Bulletins