Vulnerability · Published Oct 21, 2020 · Assigned by cisco

CVE-2020-3299Multiple 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 2.3% (higher than 83% of all known vulnerabilities).

Severity (CVSS 3.0)5.8Medium

Exploit odds (30 days)2.3%top 16.6% 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 detection of modified HTTP packets used in chunked responses. 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 products (as reported)

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

Weakness: CWE-693 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

References

20201021 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