CVE-2022-20767 Cisco Firepower Threat Defense Software DNS Enforcement Denial of Service Vulnerability
Remote attackers can cause denial of service on Cisco FTD devices by sending crafted UDP packets, affecting devices running Snort 3.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-20767?
CVE-2022-20767 is a high-severity denial of service vulnerability in Cisco Secure Firewall Threat Defense, published on 3 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2022-20767?
It affects 1 product.
Products include Cisco Secure Firewall Threat Defense.
How do I fix CVE-2022-20767?
No fix has been published for CVE-2022-20767 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-20767 being exploited?
There is no known exploitation of CVE-2022-20767 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Firewall Threat Defense
- CVE-2024-20412 Hardcoded credentials in Cisco Firepower Threat Defense Software
- CVE-2024-20330 Memory corruption in Cisco Firepower Threat Defense Software
- CVE-2024-20339 Cisco Firepower Threat Defense Software for Firepower 2100 Series TLS Denial of Service Vulnerability
- CVE-2024-20351 Cisco Firepower Threat Defense Software Snort Firewall Denial of Service Vulnerability
- CVE-2023-20083 Denial of service in Cisco Firepower Threat Defense Software
Sources
Also known as GHSA-6hf5-f728-cg27.