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

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

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
09/23/2021
Created
01/19/2022
Added
01/18/2022
Modified
05/01/2024

Description

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.

Solution(s)

  • cisco-xe-upgrade-latest

References

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