cisco-sa-asr900acl-UeEyCxkv: Cisco ASR 900 and ASR 920 Series Aggregation Services Routers Access Control List Bypass Vulnerability
First published: Wed Sep 22 2021(Updated: )
A vulnerability in the access control list (ACL) programming of Cisco ASR 900 and ASR 920 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incorrect programming of hardware when an ACL is configured using a method other than the configuration CLI. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr900acl-UeEyCxkv This advisory is part of the September 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.
Credit: Gert Döring SpaceNet
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco ASR 900 Series Software | ||
| Cisco ASR 920 Series Router |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-asr900acl-UeEyCxkv?
The severity of cisco-sa-asr900acl-UeEyCxkv is considered high due to its potential to allow unauthorized access.
How do I fix cisco-sa-asr900acl-UeEyCxkv?
To fix cisco-sa-asr900acl-UeEyCxkv, apply the patches provided by Cisco for affected ASR 900 and ASR 920 Series Routers.
Who is affected by cisco-sa-asr900acl-UeEyCxkv?
Cisco ASR 900 and ASR 920 Series Aggregation Services Routers are affected by cisco-sa-asr900acl-UeEyCxkv.
What type of vulnerabilities are associated with cisco-sa-asr900acl-UeEyCxkv?
cisco-sa-asr900acl-UeEyCxkv is associated with access control list programming vulnerabilities.
Can cisco-sa-asr900acl-UeEyCxkv be exploited remotely?
Yes, cisco-sa-asr900acl-UeEyCxkv can be exploited by unauthenticated remote attackers.
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