CVE-2021-34787 Security feature bypass in Cisco Adaptive Security Appliance (ASA) Software

Medium 5.3 Published 27 Oct 2021 Updated 7 Nov 2024

Remote attackers can bypass ACL rules and security protections on Cisco ASA/FTD devices configured with object group search.

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-2021-34787?

CVE-2021-34787 is a medium-severity vulnerability in Cisco Adaptive Security Appliance, published on 27 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the identity-based firewall (IDFW) rule processing feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass security protections. This vulnerability is due to improper handling of network requests by affected devices configured to use object group search. An attacker could exploit this vulnerability by sending a specially crafted network request to an affected device. A successful exploit could allow the attacker to bypass access control list (ACL) rules on the device, bypass security protections, and send network traffic to unauthorized hosts.

Weakness: CWE-755, CWE-183

Which versions are affected by CVE-2021-34787?

It affects 11 products.

Products include Cisco Adaptive Security Appliance, Cisco Adaptive Security Appliance Software, Cisco Asa 5505 Firmware, Cisco Asa 5512-X Firmware, Cisco Asa 5515-X Firmware, Cisco Asa 5525-X Firmware and 5 more.

How do I fix CVE-2021-34787?

No fix has been published for CVE-2021-34787 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-34787 being exploited?

There is no known exploitation of CVE-2021-34787 in the wild and no public exploit code.

All Cisco Adaptive Security Appliance vulnerabilities

Sources

Also known as GHSA-9jgg-4q8x-859v.