CVE-2021-34696

Cisco ASR 900 and ASR 920 Series Aggregation Services Routers Access Control List Bypass Vulnerability

En bref

Sévérité: MEDIUM 5.8
EPSS: EPSS 1.00 % · centile 63 (2026-10-27)
État: PUBLISHED
Publiée: 2021-09-23
Mise à jour: 2024-11-07
Attribuée par: cisco
Statut NVD: Modified

Description

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.

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	MEDIUM 5.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N	cisco
CVSS 3.1	MEDIUM 5.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N	NVD · psirt@cisco.com (Secondary)
CVSS 3.1	MEDIUM 5.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N	NVD · nvd@nist.gov (Primary)
CVSS 2.0	MEDIUM 5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N	NVD · nvd@nist.gov (Primary)

Faiblesses (CWE)

CWE-284

Références européennes

ENISA EUVD · EUVD-2021-21346
GCVE · GCVE-0-2021-34696

Configurations affectées (CPE NVD)

cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:* ≤ 17.3.2

Produits affectés

Produit	Versions
Cisco · Cisco IOS XE Software	affected n/a

Références

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr900acl-UeEyCxkv

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD