Skip to content
CVE Tracker
  • Newest CVEsPage
  • Recently added to KEVPage
  • Rising exploitation (EPSS)Page
  • Weekly digestPage
  • StatisticsPage
  • WatchlistPage
  • API documentationPage
  • MCP serverPage
  • Data sourcesPage
  • ChangelogPage
  • AboutPage
  • How it's builtPage
Back

CVE-2026-20263

Cisco IOS XE Software Blocks Extensible Exchange Protocol Denial of Service Vulnerability

High8.6EPSS 0.57%
Published
Updated
Reserved
Assigned by
cisco

Description

A vulnerability in the Blocks Extensible Exchange Protocol (BEEP) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling when parsing a specific BEEP SOAP request. An attacker could exploit this vulnerability by sending a specific BEEP SOAP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.

Scores

CVSS scores of CVE-2026-20263, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Analyzed3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.57% · top 52% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.

Weakness

Affected products

  • Cisco · Cisco IOS XE Software

    • affected 17.2.1a
    • affected 16.12.1y
    • affected 16.12.3s
    • affected 16.7.1b
    • affected 16.6.2
    • affected 16.6.5
    • affected 16.12.1w
    • affected 16.9.1d
    • affected 17.3.1
    • affected 16.9.4c
    • affected 16.7.1
    • affected 17.2.1
    • affected 16.6.8
    • affected 16.9.1b
    • affected 16.9.2s
    • affected 16.12.4
    • affected 16.12.3a
    • affected 17.1.1s
    • affected 16.11.1a
    • affected 16.7.2
    • affected 16.11.1b
    • affected 16.9.1s
    • affected 16.9.3h
    • affected 16.9.1c
    • affected 16.6.5a
    • affected 16.6.3
    • affected 16.10.1f
    • affected 17.2.1v
    • affected 16.8.1e
    • affected 16.9.3a
    • affected 16.12.1a
    • affected 16.12.1x
    • affected 16.6.4s
    • affected 16.10.1c
    • affected 16.12.3
    • affected 16.11.2
    • affected 16.6.5b
    • affected 16.12.2s
    • affected 16.10.1b
    • affected 16.7.3
    • and 227 more

What to do

Exploitation: 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.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-20263 badge
[![CVE-2026-20263](https://trackcve.app/badge/CVE-2026-20263.svg)](https://trackcve.app/cve/CVE-2026-20263)

Record last updated .