medium
5.8
CWE
693
Advisory Published
Updated

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

First published: Wed Jan 13 2021(Updated: )

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.

Credit: ykramarz@cisco.com ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
debian/snort<=2.9.7.0-5<=2.9.15.1-5<=2.9.15.1-6
2.9.20-0+deb10u1
2.9.20-0+deb11u1
Cisco Firepower Management Center=2.9.14.0
Cisco Firepower Management Center=2.9.15
Cisco Firepower Management Center=2.9.16
Cisco Firepower Management Center=2.9.17
Cisco Firepower Management Center=2.9.18
Cisco Firepower Management Center=3.0.1
Cisco Firepower Threat Defense<6.7.0
Cisco IOS XE<17.4.1
Cisco 1100-4p Integrated Services Router
Cisco 1100-8p Integrated Services Router
Cisco 1101-4p Integrated Services Router
Cisco 1109-2p Integrated Services Router
Cisco 1109-4p Integrated Services Router
Cisco 1111x-8p Integrated Services Router
Cisco 4221 Integrated Services Router
Cisco 4321 Integrated Services Router
Cisco 4331 Integrated Services Router
Cisco 4351 Integrated Services Router
Cisco 4431 Integrated Services Router
Cisco 4451-x Integrated Services Router
Cisco 4461 Integrated Services Router
Cisco Csr 1000v
Cisco Isa 3000
Snort Snort<2.9.17
Cisco Meraki Mx64 Firmware
Cisco Meraki Mx64
Cisco Meraki Mx64w Firmware
Cisco Meraki Mx64w
Cisco Meraki Mx67 Firmware
Cisco Meraki Mx67
Cisco Meraki Mx67c Firmware
Cisco Meraki Mx67c
Cisco Meraki Mx67w Firmware
Cisco Meraki Mx67w
Cisco Meraki Mx68 Firmware
Cisco Meraki Mx68
Cisco Meraki Mx68cw Firmware
Cisco Meraki Mx68cw
Cisco Meraki Mx68w Firmware
Cisco Meraki Mx68w
Cisco Meraki Mx100 Firmware
Cisco Meraki Mx100
Cisco Meraki Mx84 Firmware
Cisco Meraki Mx84
Cisco Meraki Mx250 Firmware
Cisco Meraki Mx250
Cisco Meraki Mx450 Firmware
Cisco Meraki Mx450
Cisco Secure Firewall Management Center=2.9.14.0
Cisco Secure Firewall Management Center=2.9.15
Cisco Secure Firewall Management Center=2.9.16
Cisco Secure Firewall Management Center=2.9.17
Cisco Secure Firewall Management Center=2.9.18
Cisco Secure Firewall Management Center=3.0.1
All of
Cisco IOS XE<17.4.1
Any of
Cisco 1100-4p Integrated Services Router
Cisco 1100-8p Integrated Services Router
Cisco 1101-4p Integrated Services Router
Cisco 1109-2p Integrated Services Router
Cisco 1109-4p Integrated Services Router
Cisco 1111x-8p Integrated Services Router
Cisco 4221 Integrated Services Router
Cisco 4321 Integrated Services Router
Cisco 4331 Integrated Services Router
Cisco 4351 Integrated Services Router
Cisco 4431 Integrated Services Router
Cisco 4451-x Integrated Services Router
Cisco 4461 Integrated Services Router
Cisco Csr 1000v
Cisco Isa 3000
All of
Cisco Meraki Mx64 Firmware
Cisco Meraki Mx64
All of
Cisco Meraki Mx64w Firmware
Cisco Meraki Mx64w
All of
Cisco Meraki Mx67 Firmware
Cisco Meraki Mx67
All of
Cisco Meraki Mx67c Firmware
Cisco Meraki Mx67c
All of
Cisco Meraki Mx67w Firmware
Cisco Meraki Mx67w
All of
Cisco Meraki Mx68 Firmware
Cisco Meraki Mx68
All of
Cisco Meraki Mx68cw Firmware
Cisco Meraki Mx68cw
All of
Cisco Meraki Mx68w Firmware
Cisco Meraki Mx68w
All of
Cisco Meraki Mx100 Firmware
Cisco Meraki Mx100
All of
Cisco Meraki Mx84 Firmware
Cisco Meraki Mx84
All of
Cisco Meraki Mx250 Firmware
Cisco Meraki Mx250
All of
Cisco Meraki Mx450 Firmware
Cisco Meraki Mx450

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Reference Links

Frequently Asked Questions

  • What is the vulnerability ID for this Cisco vulnerability?

    The vulnerability ID for this Cisco vulnerability is CVE-2021-1224.

  • What is the severity of CVE-2021-1224?

    The severity of CVE-2021-1224 is medium with a severity value of 5.3.

  • Which Cisco products are affected by CVE-2021-1224?

    Cisco products affected by CVE-2021-1224 include Firepower Management Center, Firepower Threat Defense, and IOS XE.

  • How can an attacker exploit CVE-2021-1224?

    An attacker can exploit CVE-2021-1224 by bypassing a configured file policy for HTTP when using TCP Fast Open (TFO) in conjunction with the Snort detection engine.

  • How do I fix CVE-2021-1224?

    To fix CVE-2021-1224, update to the recommended versions of the affected Cisco products and Snort.

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