CVE-2021-1224 Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability

Medium 5.8 Published 13 Jan 2021 Updated 12 Nov 2024

Unauthenticated remote attackers can bypass HTTP file policies on Cisco Firepower devices by exploiting TCP Fast Open handling in the Snort engine.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2021-1224?

CVE-2021-1224 is a medium-severity vulnerability in Cisco Ios Xe, published on 13 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Multiple Cisco products are affected by a vulnerability with TCP Fast Open (TFO) when used in conjunction with the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to incorrect detection of the HTTP payload if it is contained at least partially within the TFO connection handshake. An attacker could exploit this vulnerability by sending crafted TFO packets with an HTTP payload through an affected device. A successful exploit could allow the attacker to bypass configured file policy for HTTP packets and deliver a malicious payload.

Weakness: CWE-693

Which versions are affected by CVE-2021-1224?

It affects 16 products.

Products include Cisco Ios Xe, Cisco Meraki Mx100 Firmware, Cisco Meraki Mx250 Firmware, Cisco Meraki Mx450 Firmware, Cisco Meraki Mx64 Firmware, Cisco Meraki Mx64w Firmware and 10 more.

How do I fix CVE-2021-1224?

Apply the vendor's patch.

Is CVE-2021-1224 being exploited?

There is no known exploitation of CVE-2021-1224 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-p854-c355-26cj, UBUNTU-CVE-2021-1224.