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TI-2026-16466 Aliases CVE-2026-20277GHSA-6p8v-vwv7-4vg4

Cisco IOS XR Software Security Hardening Release: September 2026

Priority MEDIUM 42CWE-693Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-693.

Summary

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20277 are related to protection mechanism failure issues that are grouped under the Common Weakness Enumeration (CWE) CWE-693.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00407 35th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco IOS XR Software6.5.29; 7.0.1; 6.5.26; 6.5.25; 6.5.28; 6.5.90; 7.1.1; 7.0.90; 6.7.1; 7.0.2; 7.1.15; 7.2.1; 7.1.2; 6.7.2; 7.0.11; 7.0.12; 7.0.14; 7.1.25; 7.2.12; 7.3.1; 7.1.3; 6.7.3; 7.4.1; 7.2.2; 6.7.4; 6.5.31; 7.3.15; 7.3.16; 6.8.1; 7.4.15; 6.5.32; 7.3.2; 7.5.1; 7.4.16; 7.3.27; 7.6.1; 7.5.2; 7.8.1; 7.6.15; 7.5.12; 7.8.12; 7.3.3; 7.7.1; 6.8.2; 7.3.4; 7.4.2; 6.7.35; 6.9.1; 7.6.2; 7.5.3; 7.7.2; 6.9.2; 7.9.1; 7.10.1; 7.8.2; 7.5.4; 6.5.33; 7.8.22; 7.7.21; 7.9.2; 7.3.5; 7.5.5; 7.11.1; 7.9.21; 7.10.2; 24.1.1; 7.6.3; 7.3.6; 7.5.52; 7.11.2; 24.2.1; 24.1.2; 24.2.11; 24.3.1; 24.4.1; 24.2.2; 7.8.23; 7.11.21; 24.2.20; 24.3.2; 24.4.10; 6.5.35; 25.1.1; 24.4.2; 24.3.20; 24.4.15; 25.2.1; 6.5.351; 25.1.2; 24.3.30; 25.3.1; 6.5.352; 24.4.30; 24.2.21; 25.4.1; 25.2.2; 25.2.15; 7.2.0; 7.0.0; 25.2.30; 6.5.353; 26.1.1; 25.1.30; 25.3.15; 26.2.100; 25.4.2; 26.2.1; 25.4.30; 26.1.2; 25.4.201; 26.2.101; 25.2.21—No fix listedCNA
  • Cisco IOS XR Software VendorCisco Affected 6.5.29; 7.0.1; 6.5.26; 6.5.25; 6.5.28; 6.5.90; 7.1.1; 7.0.90; 6.7.1; 7.0.2; 7.1.15; 7.2.1; 7.1.2; 6.7.2; 7.0.11; 7.0.12; 7.0.14; 7.1.25; 7.2.12; 7.3.1; 7.1.3; 6.7.3; 7.4.1; 7.2.2; 6.7.4; 6.5.31; 7.3.15; 7.3.16; 6.8.1; 7.4.15; 6.5.32; 7.3.2; 7.5.1; 7.4.16; 7.3.27; 7.6.1; 7.5.2; 7.8.1; 7.6.15; 7.5.12; 7.8.12; 7.3.3; 7.7.1; 6.8.2; 7.3.4; 7.4.2; 6.7.35; 6.9.1; 7.6.2; 7.5.3; 7.7.2; 6.9.2; 7.9.1; 7.10.1; 7.8.2; 7.5.4; 6.5.33; 7.8.22; 7.7.21; 7.9.2; 7.3.5; 7.5.5; 7.11.1; 7.9.21; 7.10.2; 24.1.1; 7.6.3; 7.3.6; 7.5.52; 7.11.2; 24.2.1; 24.1.2; 24.2.11; 24.3.1; 24.4.1; 24.2.2; 7.8.23; 7.11.21; 24.2.20; 24.3.2; 24.4.10; 6.5.35; 25.1.1; 24.4.2; 24.3.20; 24.4.15; 25.2.1; 6.5.351; 25.1.2; 24.3.30; 25.3.1; 6.5.352; 24.4.30; 24.2.21; 25.4.1; 25.2.2; 25.2.15; 7.2.0; 7.0.0; 25.2.30; 6.5.353; 26.1.1; 25.1.30; 25.3.15; 26.2.100; 25.4.2; 26.2.1; 25.4.30; 26.1.2; 25.4.201; 26.2.101; 25.2.21 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*——Cisco
  • cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:* Versions — — ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-20277
  2. 2026-10-03 Alias added: GHSA-6p8v-vwv7-4vg4

References

Other 1

  • TI-2026-74174 Arbitrary file write in Cisco Secure Email Gateway via AMP feature KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53490 Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53489 Cisco Secure Email Gateway SQL Injection Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53488 Cisco Identity Services Engine Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-16388 Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-16344 Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
See all 7059 →

Sources

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