Vulnerability · Published Apr 29, 2021 · Assigned by cisco

CVE-2021-1495Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability

Medium 5.8

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 1.7% (higher than 78% of all known vulnerabilities).

Severity (CVSS 3.1)5.8Medium

Exploit odds (30 days)1.7%top 22.3% 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 detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to incorrect handling of specific HTTP header parameters. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass a configured file policy for HTTP packets and deliver a malicious payload.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:22.04:LTS	snort	no fix listed	UBUNTU-CVE-2021-1495

Affected products (as reported)

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

References

20210428 Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability vendor-advisory
[debian-lts-announce] 20230210 [SECURITY] [DLA 3317-1] snort security update mailing-list
DSA-5354 vendor-advisory