Unauthenticated management ACL bypass via unenforced Linux traffic
Published Sep 10, 2025 · Updated Sep 10, 2025
Access-control bypass in Cisco IOS XR Software allows remote attackers to reach SSH, NETCONF, or gRPC despite a management ACL. Packet I/O infrastructure fails to enforce management-interface ingress ACLs for Linux-handled services. Exposure requires an affected platform and release with a management ACL intended to deny one of those enabled services; the bypass reaches the service but does not bypass its authentication.
Summary
What happened
Access-control bypass in Cisco IOS XR Software allows remote attackers to reach SSH, NETCONF, or gRPC despite a management ACL. Packet I/O infrastructure fails to enforce management-interface ingress ACLs for Linux-handled services. Exposure requires an affected platform and release with a management ACL intended to deny one of those enabled services; the bypass reaches the service but does not bypass its authentication.
The record
- CVE
- CVE-2025-20159
- Published
- Sep 10, 2025
- Updated
- Sep 10, 2025
- Vendor
- ClamAV
- Product
- Cisco IOS XR Software
- Classifications
- CWE-284
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 10, 2025CVE publishedPublication date reported by the CVE source.
- Sep 10, 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=24.1.1
- Affected versionversion=24.1.2
- Affected versionversion=24.2.1
- Affected versionversion=24.2.11
- Affected versionversion=24.2.2
- Affected versionversion=24.2.20
- Affected versionversion=24.2.21
- Affected versionversion=24.3.1
- Affected versionversion=24.3.2
- Affected versionversion=24.3.20
- Affected versionversion=24.3.30
- Affected versionversion=24.4.1
- Affected versionversion=24.4.2
- Affected versionversion=24.4.30
- Affected versionversion=25.1.1
- Affected versionversion=25.1.2
- Affected versionversion=6.5.1
- Affected versionversion=6.5.2
- Affected versionversion=6.5.3
- Affected versionversion=6.6.1
- Affected versionversion=6.6.11
- Affected versionversion=6.6.12
- 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=7.0.11
- Affected versionversion=7.0.12
- Affected versionversion=7.0.14
- 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=7.11.2
- Affected versionversion=7.11.21
- Affected versionversion=7.1.2
- Affected versionversion=7.2.1
- Affected versionversion=7.2.12
- Affected versionversion=7.2.2
- Affected versionversion=7.3.1
- Affected versionversion=7.3.15
- Affected versionversion=7.3.16
- Affected versionversion=7.3.2
- Affected versionversion=7.3.27
- 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=7.4.15
- Affected versionversion=7.4.16
- Affected versionversion=7.4.2
- Affected versionversion=7.5.1
- Affected versionversion=7.5.12
- Affected versionversion=7.5.2
- Affected versionversion=7.5.3
- Affected versionversion=7.5.4
- Affected versionversion=7.5.5
- Affected versionversion=7.5.52
- Affected versionversion=7.6.1
- Affected versionversion=7.6.15
- 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=7.8.12
- 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.
Weakness, pattern, technique
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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