Vulnerability · Published May 3, 2022 · Assigned by cisco

CVE-2022-20767Cisco Firepower Threat Defense Software DNS Enforcement Denial of Service Vulnerability

High 8.6

In plain English

A high-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 77% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)1.7%top 22.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A vulnerability in the Snort rule evaluation function of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of the DNS reputation enforcement rule. An attacker could exploit this vulnerability by sending crafted UDP packets through an affected device to force a buildup of UDP connections. A successful exploit could allow the attacker to cause traffic that is going through the affected device to be dropped, resulting in a DoS condition. Note: This vulnerability only affects Cisco FTD devices that are running Snort 3.

Affected products (as reported)

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

Weakness: CWE-399 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References

20220427 Cisco Firepower Threat Defense Software DNS Enforcement Denial of Service Vulnerability vendor-advisory, x_refsource_CISCO