Improper access control in Cisco Systems, Inc products - CVE-2021-34696

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Main Vulnerability Database Vulnerabilities #VU56832

Improper access control in Cisco Systems, Inc products - CVE-2021-34696

Published: September 23, 2021


Vulnerability identifier: #VU56832
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34696
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to incorrect programming of hardware when an ACL is configured using a method other than the configuration CLI. A remote attacker can bypass an ACL on the affected device.


Affected software

ASR 920 Series Aggregation Services Router
Cisco ASR 9000 Series Aggregation Services Routers
Cisco IOS XE

How to mitigate CVE-2021-34696

Install updates from vendor's website.

Cisco IOS XE - addressed in versions 16.6.10, 16.9.8, 16.12.6, 17.3.4, 17.4.2, 17.5.1, 17.6.1

External References

Related Security Bulletins