CVE-2023-20215 Security feature bypass in Cisco Secure Web Appliance

Medium 5.8 Published 3 Aug 2023 Updated 2 Aug 2024

Unauthenticated attackers can bypass web filtering rules on Cisco Secure Web Appliances by exploiting improper detection of encoded malicious traffic.

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-2023-20215?

CVE-2023-20215 is a medium-severity vulnerability in Cisco Asyncos, published on 3 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the scanning engines of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass a configured rule, allowing traffic onto a network that should have been blocked. This vulnerability is due to improper detection of malicious traffic when the traffic is encoded with a specific content format. An attacker could exploit this vulnerability by using an affected device to connect to a malicious server and receiving crafted HTTP responses. A successful exploit could allow the attacker to bypass an explicit block rule and receive traffic that should have been rejected by the device.

Weakness: CWE-202

Which versions are affected by CVE-2023-20215?

It affects 1 product.

Products include Cisco Asyncos.

How do I fix CVE-2023-20215?

No fix has been published for CVE-2023-20215 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-20215 being exploited?

There is no known exploitation of CVE-2023-20215 in the wild and no public exploit code.

All Cisco Asyncos vulnerabilities

Sources

Also known as GHSA-4qcp-whvm-5mwc.