What is the severity of CVE-2021-34753?

CVE-2021-34753 is rated as a high-severity vulnerability that allows attackers to bypass rules for Ethernet Industrial Protocol traffic.

How do I fix CVE-2021-34753?

To fix CVE-2021-34753, update your Cisco Firepower Threat Defense software to the latest version as recommended by Cisco.

Who is affected by CVE-2021-34753?

CVE-2021-34753 affects users of Cisco Firepower Threat Defense software that process Ethernet Industrial Protocol traffic.

What type of attack does CVE-2021-34753 allow?

CVE-2021-34753 allows unauthenticated remote attackers to bypass configured security rules for ENIP traffic.

Is CVE-2021-34753 exploit-related?

Yes, CVE-2021-34753 is considered exploit-related as it enables attackers to evade detection and potentially compromise network security.

Vulnerability/
CVE-2021-34753

medium

5.8

CWE

284

15/11/2024

18/11/2024

CVE-2021-34753: Cisco Firepower Threat Defense Ethernet Industrial Protocol Policy Bypass Vulnerabilities

First published: Fri Nov 15 2024(Updated: )

A vulnerability in the payload inspection for Ethernet Industrial Protocol (ENIP) traffic for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured rules for ENIP traffic. This vulnerability is due to incomplete processing during deep packet inspection for ENIP packets. An attacker could exploit this vulnerability by sending a crafted ENIP packet to the targeted interface. A successful exploit could allow the attacker to bypass configured access control and intrusion policies that should trigger and drop for the ENIP packet.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco Firepower Threat Defense

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Reference Links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-enip-bypass-eFsxd8KP

Frequently Asked Questions

What is the severity of CVE-2021-34753?
CVE-2021-34753 is rated as a high-severity vulnerability that allows attackers to bypass rules for Ethernet Industrial Protocol traffic.
How do I fix CVE-2021-34753?
To fix CVE-2021-34753, update your Cisco Firepower Threat Defense software to the latest version as recommended by Cisco.
Who is affected by CVE-2021-34753?
CVE-2021-34753 affects users of Cisco Firepower Threat Defense software that process Ethernet Industrial Protocol traffic.
What type of attack does CVE-2021-34753 allow?
CVE-2021-34753 allows unauthenticated remote attackers to bypass configured security rules for ENIP traffic.
Is CVE-2021-34753 exploit-related?
Yes, CVE-2021-34753 is considered exploit-related as it enables attackers to evade detection and potentially compromise network security.

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