What is the severity of CVE-2021-1616?

CVE-2021-1616 has a high severity rating due to its potential to allow unauthenticated remote access.

How do I fix CVE-2021-1616?

To fix CVE-2021-1616, update your Cisco IOS XE software to a version later than 17.6.1.

What systems are affected by CVE-2021-1616?

CVE-2021-1616 affects devices running Cisco IOS XE versions prior to 17.6.1 that use H.323 ALG.

What type of attack does CVE-2021-1616 allow?

CVE-2021-1616 allows an unauthenticated remote attacker to bypass the H.323 ALG.

Is there a workaround for CVE-2021-1616?

Currently, there are no documented workarounds for CVE-2021-1616 besides upgrading to the patched software version.

Vulnerability/
CVE-2021-1616

medium

4.7

CWE

693

23/9/2021

7/11/2024

CVE-2021-1616: Cisco IOS XE Software H.323 Application Level Gateway Bypass Vulnerability

First published: Thu Sep 23 2021(Updated: )

A vulnerability in the H.323 application level gateway (ALG) used by the Network Address Translation (NAT) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to bypass the ALG. This vulnerability is due to insufficient data validation of traffic that is traversing the ALG. An attacker could exploit this vulnerability by sending crafted traffic to a targeted device. A successful exploit could allow the attacker to bypass the ALG and open connections that should not be allowed to a remote device located behind the ALG. Note: This vulnerability has been publicly discussed as NAT Slipstreaming.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS XE Web UI	<17.6.1

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-h323alg-bypass-4vy2MP2Q

Frequently Asked Questions

What is the severity of CVE-2021-1616?
CVE-2021-1616 has a high severity rating due to its potential to allow unauthenticated remote access.
How do I fix CVE-2021-1616?
To fix CVE-2021-1616, update your Cisco IOS XE software to a version later than 17.6.1.
What systems are affected by CVE-2021-1616?
CVE-2021-1616 affects devices running Cisco IOS XE versions prior to 17.6.1 that use H.323 ALG.
What type of attack does CVE-2021-1616 allow?
CVE-2021-1616 allows an unauthenticated remote attacker to bypass the H.323 ALG.
Is there a workaround for CVE-2021-1616?
Currently, there are no documented workarounds for CVE-2021-1616 besides upgrading to the patched software version.

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