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CVE-2025-20144

Cisco IOS XR Software Access Control List Bypass Vulnerability

Description

A vulnerability in the hybrid access control list (ACL) processing of IPv4 packets in Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incorrect handling of packets when a specific configuration of the hybrid ACL exists. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass a configured ACL on the affected device. For more information, see the section of this advisory. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.

Timeline

  1. ID reserved

    By cisco

  2. · 5 months later

    Published

  3. · 9 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-20144, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium4.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
NVDNVD · Analyzed3.1Medium5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
EPSS (exploitation in 30 days)
0.35% · top 71% of all CVEs (11 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.0.

Affected products

  • Cisco · Cisco IOS XR Software

    • affected 6.5.3
    • affected 6.5.2
    • affected 6.5.92
    • affected 6.5.1
    • affected 6.6.2
    • affected 7.0.1
    • affected 6.6.25
    • affected 6.6.1
    • affected 6.5.93
    • affected 7.1.1
    • affected 7.0.90
    • affected 6.6.3
    • affected 7.0.2
    • affected 7.2.1
    • affected 7.1.2
    • affected 6.6.4
    • affected 7.3.1
    • affected 7.4.1
    • affected 7.2.2
    • affected 7.3.2
    • affected 7.5.1
    • affected 7.6.1
    • affected 7.5.2
    • affected 7.7.1
    • affected 7.3.3
    • affected 7.4.2
    • affected 7.3.4
    • affected 7.6.2
    • affected 7.8.1
    • affected 7.5.3
    • affected 7.7.2
    • affected 7.9.1
    • affected 7.8.2
    • affected 7.5.4
    • affected 7.8.22
    • affected 7.10.1
    • affected 7.7.21
    • affected 7.9.2
    • affected 7.3.5
    • affected 7.5.5
    • and 3 more

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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[![CVE-2025-20144](https://cveledger.app/badge/CVE-2025-20144.svg)](https://cveledger.app/cve/CVE-2025-20144)

Record last updated .