cisco-sa-xe-webui-dos-PtAODAWWMediumCVSS 6.3

Cisco IOS XE Software Web-Based Management Interface Denial of Service Vulnerability

Published
August 5, 2026
Last Modified
August 5, 2026

🔗 CVE IDs covered (1)

CVE-2026-20311 →

📋 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.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

CVE-2026-20311 — Cisco IOS XE Software Web UI Denial of Service Vulnerability (CVSS 3.1 6.3, CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H)

🎯 Affected products156

  • Cisco IOS XE Software
  • Cisco IOS XE Software 17.10.1
  • Cisco IOS XE Software 17.10.1a
  • Cisco IOS XE Software 17.10.1b
  • Cisco IOS XE Software 17.11.1
  • Cisco IOS XE Software 17.11.1a
  • Cisco IOS XE Software 17.12.1
  • Cisco IOS XE Software 17.12.1a
  • Cisco IOS XE Software 17.12.1w
  • Cisco IOS XE Software 17.12.1x
  • Cisco IOS XE Software 17.12.1y
  • Cisco IOS XE Software 17.12.1z
  • Cisco IOS XE Software 17.12.1z1
  • Cisco IOS XE Software 17.12.1z2
  • Cisco IOS XE Software 17.12.1z3
  • Cisco IOS XE Software 17.12.1z4
  • Cisco IOS XE Software 17.12.1z5
  • Cisco IOS XE Software 17.12.1z6
  • Cisco IOS XE Software 17.12.2
  • Cisco IOS XE Software 17.12.2a
  • Cisco IOS XE Software 17.12.3
  • Cisco IOS XE Software 17.12.3a
  • Cisco IOS XE Software 17.12.4
  • Cisco IOS XE Software 17.12.4a
  • Cisco IOS XE Software 17.12.4b
  • Cisco IOS XE Software 17.12.5
  • Cisco IOS XE Software 17.12.5a
  • Cisco IOS XE Software 17.12.5b
  • Cisco IOS XE Software 17.12.5c
  • Cisco IOS XE Software 17.12.5d
  • +126 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address this vulnerability.

🔗 References (3)