Answer in brief
CVE-2026-20040 records a High severity (CVSS 8.8) vulnerability in Cisco IOS XR Software CLI Privilege Escalation Vulnerability. The current sources do not mark it as known exploited. The current feed maps 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco IOS XR Softwaregeneric | 6.5.3 || 6.5.29 || 6.5.1 || 6.6.1 || 6.5.2 || 6.5.92 || 6.5.15 || 6.6.2 || 7.0.1 || 6.6.25 || 6.5.26 || 6.6.11 || 6.5.25 || 6.5.28 || 6.5.93 || 6.6.12 || 6.5.90 || 7.1.1 || 7.0.90 || 6.6.3 || 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 || 6.6.4 || 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 || 25.1.30 || 25.3.15 | Not reported |
Published upstream
Mar 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to execute arbitrary commands as root on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user arguments that are passed to specific CLI commands. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the prompt. A successful exploit could allow the attacker to elevate privileges to root and execute arbitrary commands on the underlying operating system.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-20040 records a High severity (CVSS 8.8) vulnerability in Cisco IOS XR Software CLI Privilege Escalation Vulnerability. The current sources do not mark it as known exploited. The current feed maps 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco IOS XR Softwaregeneric | 6.5.3 || 6.5.29 || 6.5.1 || 6.6.1 || 6.5.2 || 6.5.92 || 6.5.15 || 6.6.2 || 7.0.1 || 6.6.25 || 6.5.26 || 6.6.11 || 6.5.25 || 6.5.28 || 6.5.93 || 6.6.12 || 6.5.90 || 7.1.1 || 7.0.90 || 6.6.3 || 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 || 6.6.4 || 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 || 25.1.30 || 25.3.15 | Not reported |
Published upstream
Mar 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to execute arbitrary commands as root on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user arguments that are passed to specific CLI commands. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the prompt. A successful exploit could allow the attacker to elevate privileges to root and execute arbitrary commands on the underlying operating system.
Quoted source text, attributed separately from HOL analysis.