CVE-2020-3565 Cisco Firepower Threat Defense Software TCP Intercept Bypass Vulnerability
An unauthenticated remote attacker can bypass Access Control Policies and Service Policies by exploiting a flaw in TCP Intercept functionality.
- 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-2020-3565?
CVE-2020-3565 is a medium-severity vulnerability in Cisco Secure Firewall Threat Defense, published on 21 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the TCP Intercept functionality of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured Access Control Policies (including Geolocation) and Service Polices on an affected system. The vulnerability exists because TCP Intercept is invoked when the embryonic connection limit is reached, which can cause the underlying detection engine to process the packet incorrectly. An attacker could exploit this vulnerability by sending a crafted stream of traffic that matches a policy on which TCP Intercept is configured. A successful exploit could allow the attacker to match on an incorrect policy, which could allow the traffic to be forwarded when it should be dropped. In addition, the traffic could incorrectly be dropped.
Which versions are affected by CVE-2020-3565?
It affects 1 product.
Products include Cisco Secure Firewall Threat Defense.
How do I fix CVE-2020-3565?
No fix has been published for CVE-2020-3565 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-3565 being exploited?
There is no known exploitation of CVE-2020-3565 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-6m36-86vp-x4xx.