Answer in brief
CVE-2026-20308 records a Medium severity (CVSS 4.3) vulnerability in Cisco IOS XE Software Web-Based Management Interface Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco IOS XE 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 4.3. 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 XE Software (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco IOS XE Softwaregeneric | 17.2.1a || 16.12.1y || 16.12.3s || 16.12.1w || 16.9.1d || 17.3.1 || 16.9.4c || 17.2.1 || 16.9.1b || 16.9.2s || 16.12.4 || 16.12.3a || 17.1.1s || 16.11.1a || 16.11.1b || 16.9.1s || 16.9.3h || 16.9.1c || 16.10.1f || 17.2.1v || 16.9.3a || 16.12.1a || 16.12.1x || 16.10.1c || 16.12.3 || 16.11.2 || 16.12.2s || 16.10.1b || 16.9.6 || 16.9.2 || 16.10.1 || 16.12.1t || 16.9.1 || 16.9.3s || 16.12.2 || 16.11.1 || 16.9.3 || 16.11.1s || 16.12.1 || 17.1.1 || 17.1.2 || 16.10.1d || 17.1.1t || 16.9.4 || 16.12.2t || 16.9.5 || 16.10.1e || 16.10.1a || 16.12.1z || 16.9.1a || 16.9.5f || 16.10.1g || 16.9.2a || 16.10.3 || 16.11.1c || 16.10.1s || 17.2.1r || 17.1.1a || 16.10.2 || 16.12.2a || 16.12.1c || 16.12.1s || 17.2.2 || 16.9.8 || 16.9.7 || 17.1.3 || 17.3.1a || 17.3.2a || 16.12.5 || 17.3.1w || 17.3.2 || 17.4.1 || 16.12.4a || 17.4.1a || 17.3.1x || 17.3.3 || 17.2.3 || 17.5.1 || 16.12.1z1 || 16.12.5a || 17.4.1b || 17.3.1z || 16.12.5b || 17.4.2 || 17.3.3a || 17.3.5 || 17.3.4 || 17.5.1a || 16.12.6 || 17.6.1 || 16.12.1z2 || 17.3.4a || 17.6.1a || 17.7.1 || 17.6.1x || 17.6.2 || 16.12.6a || 17.3.4c || 17.4.2a || 17.3.4b || 17.7.1a || 16.12.7 || 17.8.1a || 17.6.3a || 17.6.3 || 17.7.2 || 17.7.1b || 17.9.1w || 17.3.5a || 17.6.1z || 16.12.8 || 17.8.1 || 17.9.1 || 17.6.4 || 17.3.5b || 17.9.1a || 17.3.6 || 17.10.1 || 16.9.8a || 17.6.1z1 || 17.10.1a || 17.9.2 || 17.6.5 || 17.9.1x || 17.9.1y || 16.9.8b || 17.3.7 || 17.9.2a || 17.9.3 || 16.12.9 || 17.11.1 || 17.10.1b || 17.6.6 || 17.9.1x1 || 17.11.1a || 17.9.3a || 17.12.1 || 17.3.8 || 17.9.4 || 16.12.10 || 17.12.1w || 17.9.1y1 || 17.12.1a || 17.9.5 || 17.13.1 || 17.12.1x || 17.12.2 || 17.14.1 || 17.9.4a || 17.3.8a || 17.6.6a || 17.6.5a || 17.6.7 || 16.12.10a || 17.15.1 || 17.13.1a || 17.12.2a || 16.12.11 || 17.12.3 || 17.12.1y || 17.12.1z || 17.9.5a || 17.14.1a || 17.9.5b || 17.6.8 || 16.12.12 || 17.12.4 || 17.9.6 || 17.17.1 || 17.16.1 || 17.15.1w || 17.12.3a || 17.9.5c || 17.15.1a || 17.12.1z1 || 17.15.2 || 17.15.1b || 17.9.5d || 17.15.1x || 17.9.6a || 17.12.1z2 || 17.6.8a || 17.16.1a || 16.12.13 || 17.15.3 || 17.9.7 || 17.12.5 || 17.15.1y || 17.9.5e || 17.12.4a || 17.15.2a || 17.15.2c || 17.15.2b || 17.12.1z3 || 17.9.5f || 17.12.4b || 17.12.5a || 17.18.1 || 17.12.6 || 17.12.1z4 || 17.9.8 || 17.9.7a || 17.15.3a || 17.15.4 || 17.12.5b || 17.15.3b || 16.12.14 || 17.18.1z || 17.9.7b || 17.12.5c || 26.1.1 || 17.18.1a || 17.15.4a || 17.18.2 || 17.18.1w || 17.15.4b || 17.12.6a || 17.12.7 || 17.15.4c || 17.9.9 || 17.12.5d || 16.12.15 || 17.15.4s1 || 17.15.5 || 17.12.1z5 || 17.18.1x || 17.12.1z6 || 17.15.4d || 17.12.6b || 17.4.1c || 17.15.5a || 17.18.1y || 17.12.7a || 17.18.3 || 17.12.7b || 17.18.3a || 26.1.1a || 26.2.1ea || 16.12.16 | Not reported |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the web-based management interface to become unresponsive.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-20308 records a Medium severity (CVSS 4.3) vulnerability in Cisco IOS XE Software Web-Based Management Interface Vulnerability. The current sources do not mark it as known exploited. The current feed maps Cisco/Cisco IOS XE 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 4.3. 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 XE Software (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cisco/Cisco IOS XE Softwaregeneric | 17.2.1a || 16.12.1y || 16.12.3s || 16.12.1w || 16.9.1d || 17.3.1 || 16.9.4c || 17.2.1 || 16.9.1b || 16.9.2s || 16.12.4 || 16.12.3a || 17.1.1s || 16.11.1a || 16.11.1b || 16.9.1s || 16.9.3h || 16.9.1c || 16.10.1f || 17.2.1v || 16.9.3a || 16.12.1a || 16.12.1x || 16.10.1c || 16.12.3 || 16.11.2 || 16.12.2s || 16.10.1b || 16.9.6 || 16.9.2 || 16.10.1 || 16.12.1t || 16.9.1 || 16.9.3s || 16.12.2 || 16.11.1 || 16.9.3 || 16.11.1s || 16.12.1 || 17.1.1 || 17.1.2 || 16.10.1d || 17.1.1t || 16.9.4 || 16.12.2t || 16.9.5 || 16.10.1e || 16.10.1a || 16.12.1z || 16.9.1a || 16.9.5f || 16.10.1g || 16.9.2a || 16.10.3 || 16.11.1c || 16.10.1s || 17.2.1r || 17.1.1a || 16.10.2 || 16.12.2a || 16.12.1c || 16.12.1s || 17.2.2 || 16.9.8 || 16.9.7 || 17.1.3 || 17.3.1a || 17.3.2a || 16.12.5 || 17.3.1w || 17.3.2 || 17.4.1 || 16.12.4a || 17.4.1a || 17.3.1x || 17.3.3 || 17.2.3 || 17.5.1 || 16.12.1z1 || 16.12.5a || 17.4.1b || 17.3.1z || 16.12.5b || 17.4.2 || 17.3.3a || 17.3.5 || 17.3.4 || 17.5.1a || 16.12.6 || 17.6.1 || 16.12.1z2 || 17.3.4a || 17.6.1a || 17.7.1 || 17.6.1x || 17.6.2 || 16.12.6a || 17.3.4c || 17.4.2a || 17.3.4b || 17.7.1a || 16.12.7 || 17.8.1a || 17.6.3a || 17.6.3 || 17.7.2 || 17.7.1b || 17.9.1w || 17.3.5a || 17.6.1z || 16.12.8 || 17.8.1 || 17.9.1 || 17.6.4 || 17.3.5b || 17.9.1a || 17.3.6 || 17.10.1 || 16.9.8a || 17.6.1z1 || 17.10.1a || 17.9.2 || 17.6.5 || 17.9.1x || 17.9.1y || 16.9.8b || 17.3.7 || 17.9.2a || 17.9.3 || 16.12.9 || 17.11.1 || 17.10.1b || 17.6.6 || 17.9.1x1 || 17.11.1a || 17.9.3a || 17.12.1 || 17.3.8 || 17.9.4 || 16.12.10 || 17.12.1w || 17.9.1y1 || 17.12.1a || 17.9.5 || 17.13.1 || 17.12.1x || 17.12.2 || 17.14.1 || 17.9.4a || 17.3.8a || 17.6.6a || 17.6.5a || 17.6.7 || 16.12.10a || 17.15.1 || 17.13.1a || 17.12.2a || 16.12.11 || 17.12.3 || 17.12.1y || 17.12.1z || 17.9.5a || 17.14.1a || 17.9.5b || 17.6.8 || 16.12.12 || 17.12.4 || 17.9.6 || 17.17.1 || 17.16.1 || 17.15.1w || 17.12.3a || 17.9.5c || 17.15.1a || 17.12.1z1 || 17.15.2 || 17.15.1b || 17.9.5d || 17.15.1x || 17.9.6a || 17.12.1z2 || 17.6.8a || 17.16.1a || 16.12.13 || 17.15.3 || 17.9.7 || 17.12.5 || 17.15.1y || 17.9.5e || 17.12.4a || 17.15.2a || 17.15.2c || 17.15.2b || 17.12.1z3 || 17.9.5f || 17.12.4b || 17.12.5a || 17.18.1 || 17.12.6 || 17.12.1z4 || 17.9.8 || 17.9.7a || 17.15.3a || 17.15.4 || 17.12.5b || 17.15.3b || 16.12.14 || 17.18.1z || 17.9.7b || 17.12.5c || 26.1.1 || 17.18.1a || 17.15.4a || 17.18.2 || 17.18.1w || 17.15.4b || 17.12.6a || 17.12.7 || 17.15.4c || 17.9.9 || 17.12.5d || 16.12.15 || 17.15.4s1 || 17.15.5 || 17.12.1z5 || 17.18.1x || 17.12.1z6 || 17.15.4d || 17.12.6b || 17.4.1c || 17.15.5a || 17.18.1y || 17.12.7a || 17.18.3 || 17.12.7b || 17.18.3a || 26.1.1a || 26.2.1ea || 16.12.16 | Not reported |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the web-based management interface to become unresponsive.
Quoted source text, attributed separately from HOL analysis.