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TI-2023-06897 Aliases CVE-2023-20191GHSA-5hxg-4c73-j4wf

Improper access control in Cisco IOS XR Software

Priority LOW 34CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-284.

Summary

A vulnerability in the access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incomplete support for this feature. 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. There are workarounds that address this vulnerability. This advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication .

Why it matters now

EPSS 0.00598 48th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco IOS XR Software6.4.1; 6.5.1; 6.5.2; 6.5.3; 6.6.2; 6.6.3; 6.6.25; 6.6.4; 7.0.1; 7.0.2; 7.1.1; 7.1.2; 7.2.1; 7.2.2; 7.3.1; 7.3.2; 7.3.3; 7.3.5; 7.4.1; 7.4.2; 7.5.1; 7.5.3; 7.5.2; 7.5.4; 7.6.1; 7.6.2; 7.7.1; 7.7.2; 7.8.1; 7.8.2; 7.9.1—No fix listedCNA
  • Cisco IOS XR Software VendorCisco Affected 6.4.1; 6.5.1; 6.5.2; 6.5.3; 6.6.2; 6.6.3; 6.6.25; 6.6.4; 7.0.1; 7.0.2; 7.1.1; 7.1.2; 7.2.1; 7.2.2; 7.3.1; 7.3.2; 7.3.3; 7.3.5; 7.4.1; 7.4.2; 7.5.1; 7.5.3; 7.5.2; 7.5.4; 7.6.1; 7.6.2; 7.7.1; 7.7.2; 7.8.1; 7.8.2; 7.9.1 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*before 7.7.21; 7.8 to before 7.9.2VulnerableCisco
cpe:2.3:o:cisco:ios_xr:7.10:*:*:*:*:*:*:*7.10VulnerableCisco
  • cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:* Versions before 7.7.21; 7.8 to before 7.9.2 Vulnerable ·Cisco
  • cpe:2.3:o:cisco:ios_xr:7.10:*:*:*:*:*:*:* Versions 7.10 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-20191
  2. 2026-10-03 Alias added: GHSA-5hxg-4c73-j4wf

References

Advisory 1

  • TI-2020-02680 Cisco IOS XR Software Cisco Discovery Protocol Format String Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
  • TI-2020-03113 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities KEVCVSS 3.1HIGH 8.6
  • TI-2020-03110 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability KEVCVSS 3.1HIGH 8.6
  • TI-2018-00142 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.0
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
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Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences