CVE-2026-20311

mediumpriority · track · 0EPSS 0.003 · 17 %ileDEEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.25% (17th) EPSS
CVSS 6.3 · medium
Is it mine?
320 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · cert_bund · cisco_csaf

EPSS · scored 2026-10-27

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

6.3
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU
v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · psirt@cisco.com USexploitability 1.8 · impact 4
v3.15.8mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · Cisco PSIRT US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-126US
05

affected products (320)

Products and version ranges known to be affected.

showing 20 of 320
06

advisories (2)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-2674Cisco IOS XE: Mehrere SchwachstellenDeutsch2026-08-05csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Cisco IOS XE ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder einen Denial-of-Service-Zustand herbeizuführen.

  • cisco-sa-xe-webui-dos-PtAODAWWCisco IOS XE Software Web-Based Management Interface Denial of Service Vulnerability2026-08-05csaf · cisco_csafUS

    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.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcert_bundcisco_csafNVDCVE.orgMITRE
published 2026-08-05modified 2026-10-23
09

references (3)

External citations — patches, advisories, analysis.

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