Answer in brief
CVE-2026-20275 records a High severity (CVSS 8.8) vulnerability in Cisco IOS XR Software Security Hardening Release: September 2026. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco IOS XR Software (generic), Cisco/Cisco IOS XR Software (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cisco/Cisco IOS XR Software (generic), Cisco/Cisco IOS XR Software (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco IOS XR Softwaregeneric | 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 | Not reported |
| Cisco/Cisco IOS XR Softwaregeneric | 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 | Not reported |
Published upstream
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 2, 2026
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-2026-20275 are related to incorrect calculation issues that are grouped under the Common Weakness Enumeration (CWE) CWE-682.
Quoted source text, attributed separately from HOL analysis.