ACL bypass via repeated object-group entries
Published Mar 12, 2025 · Updated Mar 21, 2025
Improper access control in Cisco IOS XR Software allows remote attackers to bypass a hybrid IPv4 ACL with crafted transit traffic. Hybrid ACL processing mishandles compress level 3 rules when 32 or more source or destination object groups repeat the same IPv4 entry. Only listed NCS and white-box platforms with that configuration are affected; successful transit traffic reaches assets the ACL was meant to protect.
Summary
What happened
Improper access control in Cisco IOS XR Software allows remote attackers to bypass a hybrid IPv4 ACL with crafted transit traffic. Hybrid ACL processing mishandles compress level 3 rules when 32 or more source or destination object groups repeat the same IPv4 entry. Only listed NCS and white-box platforms with that configuration are affected; successful transit traffic reaches assets the ACL was meant to protect.
The record
- CVE
- CVE-2025-20144
- Published
- Mar 12, 2025
- Updated
- Mar 21, 2025
- Vendor
- ClamAV
- Product
- Cisco IOS XR Software
- Classifications
- CWE-284, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 12, 2025CVE publishedPublication date reported by the CVE source.
- Mar 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.5.1
- Affected versionversion=6.5.2
- Affected versionversion=6.5.3
- Affected versionversion=6.5.92
- Affected versionversion=6.5.93
- Affected versionversion=6.6.1
- Affected versionversion=6.6.2
- Affected versionversion=6.6.25
- Affected versionversion=6.6.3
- Affected versionversion=6.6.4
- Affected versionversion=7.0.1
- Affected versionversion=7.0.2
- Affected versionversion=7.0.90
- Affected versionversion=7.10.1
- Affected versionversion=7.10.2
- Affected versionversion=7.1.1
- Affected versionversion=7.11.1
- Affected versionversion=7.1.2
- Affected versionversion=7.2.1
- Affected versionversion=7.2.2
- Affected versionversion=7.3.1
- Affected versionversion=7.3.2
- Affected versionversion=7.3.3
- Affected versionversion=7.3.4
- Affected versionversion=7.3.5
- Affected versionversion=7.3.6
- Affected versionversion=7.4.1
- Affected versionversion=7.4.2
- Affected versionversion=7.5.1
- Affected versionversion=7.5.2
- Affected versionversion=7.5.3
- Affected versionversion=7.5.4
- Affected versionversion=7.5.5
- Affected versionversion=7.6.1
- Affected versionversion=7.6.2
- Affected versionversion=7.7.1
- Affected versionversion=7.7.2
- Affected versionversion=7.7.21
- Affected versionversion=7.8.1
- Affected versionversion=7.8.2
- Affected versionversion=7.8.22
- Affected versionversion=7.9.1
- Affected versionversion=7.9.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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