Cisco IOS XR Software Access Control List Bypass Vulnerability
Published Mar 12, 2025
5.8
MEDIUMCVSS 3.1
EPSS 0.34%
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.
Affected products
-
- Version 6.5.1StatusaffectedConstraints-
- Version 6.5.2StatusaffectedConstraints-
- Version 6.5.3StatusaffectedConstraints-
- Version 6.5.92StatusaffectedConstraints-
- Version 6.5.93StatusaffectedConstraints-
- Version 6.6.1StatusaffectedConstraints-
- Version 6.6.2StatusaffectedConstraints-
- Version 6.6.25StatusaffectedConstraints-
- Version 6.6.3StatusaffectedConstraints-
- Version 6.6.4StatusaffectedConstraints-
- Version 7.0.1StatusaffectedConstraints-
- Version 7.0.2StatusaffectedConstraints-
- Version 7.0.90StatusaffectedConstraints-
- Version 7.1.1StatusaffectedConstraints-
- Version 7.1.2StatusaffectedConstraints-
- Version 7.10.1StatusaffectedConstraints-
- Version 7.10.2StatusaffectedConstraints-
- Version 7.11.1StatusaffectedConstraints-
- Version 7.2.1StatusaffectedConstraints-
- Version 7.2.2StatusaffectedConstraints-
- Version 7.3.1StatusaffectedConstraints-
- Version 7.3.2StatusaffectedConstraints-
- Version 7.3.3StatusaffectedConstraints-
- Version 7.3.4StatusaffectedConstraints-
- Version 7.3.5StatusaffectedConstraints-
- Version 7.3.6StatusaffectedConstraints-
- Version 7.4.1StatusaffectedConstraints-
- Version 7.4.2StatusaffectedConstraints-
- Version 7.5.1StatusaffectedConstraints-
- Version 7.5.2StatusaffectedConstraints-
- Version 7.5.3StatusaffectedConstraints-
- Version 7.5.4StatusaffectedConstraints-
- Version 7.5.5StatusaffectedConstraints-
- Version 7.6.1StatusaffectedConstraints-
- Version 7.6.2StatusaffectedConstraints-
- Version 7.7.1StatusaffectedConstraints-
- Version 7.7.2StatusaffectedConstraints-
- Version 7.7.21StatusaffectedConstraints-
- Version 7.8.1StatusaffectedConstraints-
- Version 7.8.2StatusaffectedConstraints-
- Version 7.8.22StatusaffectedConstraints-
- Version 7.9.1StatusaffectedConstraints-
- Version 7.9.2StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Cisco | Cisco IOS XR Software | n/a |
|
- 6.5.1
- 6.5.2
- 6.5.3
- 6.5.92
- 6.5.93
- 6.6.1
- 6.6.2
- 6.6.3
- 6.6.4
- 6.6.25
- 7.0.1
- 7.0.2
- 7.0.90
- 7.1.1
- 7.1.2
- 7.2.1
- 7.2.2
- 7.3.1
- 7.3.2
- 7.3.3
- 7.3.4
- 7.3.5
- 7.3.6
- 7.4.1
- 7.4.2
- 7.5.1
- 7.5.2
- 7.5.3
- 7.5.4
- 7.5.5
- 7.6.1
- 7.6.2
- 7.7.1
- 7.7.2
- 7.7.21
- 7.8.1
- 7.8.2
- 7.8.22
- 7.9.1
- 7.9.2
- 7.10.1
- 7.10.2
- 7.11.1
Running on/with
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No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Mar 21, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2025–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (4 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.34% (0.00341) | 25.23th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.32% (0.00322) | 23.67th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.02% (0.00020) | 3.05th | v4 (v2025.03.14) |
| Mar 13, 2025 | 0.05% (0.00046) | 19.89th | v3 (v2023.03.01) |
References (2)
- https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/ Technical Description
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncs-hybridacl-crMZFfKQ Vendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://blog.apnic.net/2024/09/02/crafting-endless-as-paths-in-bgp/ | Technical Description | |
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncs-hybridacl-crMZFfKQ | Vendor Advisory |
Change history (0)
No recorded changes yet.