Cisco IOS XE Software Web UI Denial of Service Vulnerability
Summary
| CVE | CVE-2026-20311 |
|---|---|
| State | PUBLISHED |
| Assigner | cisco |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-05 17:16:51 UTC |
| Updated | 2026-08-06 15:44:56 UTC |
| Description | A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. |
Risk And Classification
Primary CVSS: v3.1 6.3 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS: 0.001580000 probability, percentile 0.053740000 (date 2026-08-09)
Problem Types: CWE-126 | CWE-126 Buffer Over-read
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 6.3 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H |
| 3.1 | CNA | CVSSV3_1 | 6.3 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.2a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.1w | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.4.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.4.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.1x | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.3 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.5.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.4.1b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.1z | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.4.2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.3a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.5 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.4 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.5.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.4a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.7.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.1x | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.4c | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.4.2a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.4b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.7.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.8.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.3a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.3 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.7.2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.7.1b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.1w | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.5a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.1z | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.8.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.4 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.5b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.6 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.10.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.1z1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.10.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.5 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.1x | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.1y | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.7 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.2a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.3 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.11.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.10.1b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.6 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.1x1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.11.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.3a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.8 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.4 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1w | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.1y1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.5 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.13.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1x | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.14.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.4a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.3.8a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.6a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.5a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.7 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.13.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.2a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.3 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1y | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1z | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.5a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.14.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.5b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.8 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.4 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.6 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.17.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.16.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.1w | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.3a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.5c | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1z1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.1b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.5d | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.1x | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.6a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1z2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.6.8a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.16.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.3 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.7 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.5 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.1y | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.5e | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.4a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.2a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.2c | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.2b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1z3 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.5f | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.4b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.5a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.6 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1z4 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.8 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.7a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.3a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.4 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.5b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.3b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.1z | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.7b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.5c | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 26.1.1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.4a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.2 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.1w | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.4b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.6a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.7 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.4c | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.9.9 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.5d | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.4s1 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.5 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1z5 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.1x | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.1z6 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.4d | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.6b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.4.1c | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.15.5a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.1y | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.7a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.3 | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.12.7b | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 17.18.3a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 26.1.1a | Not specified |
| CNA | Cisco | Cisco IOS XE Software | affected 26.2.1ea | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-web... | [email protected] | sec.cloudapps.cisco.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Exploits
CNA: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
There are currently no legacy QID mappings associated with this CVE.