Vulnerability · Published Jan 13, 2021 · Assigned by cisco

CVE-2021-1236Multiple Cisco Products Snort Application Detection Engine Policy Bypass Vulnerability

Medium 4.0

In plain English

A medium-severity security flaw in Cisco Firepower Threat Defense Software from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 83% of all known vulnerabilities).

Severity (CVSS 3.0)4.0Medium

Exploit odds (30 days)2.2%top 17.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Multiple Cisco products are affected by a vulnerability in the Snort application detection engine that could allow an unauthenticated, remote attacker to bypass the configured policies on an affected system. The vulnerability is due to a flaw in the detection algorithm. An attacker could exploit this vulnerability by sending crafted packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco Firepower Threat Defense Software	n/a

Weakness: CWE-670 · Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

References

20210113 Multiple Cisco Products Snort Application Detection Engine Policy Bypass Vulnerability vendor-advisory
[debian-lts-announce] 20230210 [SECURITY] [DLA 3317-1] snort security update mailing-list
DSA-5354 vendor-advisory