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Review reviewHigh

CVE-2026-20263

Cisco Cisco IOS XE Software

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.

CVSS
8.6
EPSS
0.33%
25.3% percentile
CISA KEV
Not listed
Published
2026.08.06
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.33%
Technical severityCVSS 8.6

Vulnerability overview

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.

Affected product and versions

Product
Cisco Cisco IOS XE Software
Affected versions
>= 17.2.1a, >= 16.12.1y, >= 16.12.3s, >= 16.7.1b, >= 16.6.2, >= 16.6.5, >= 16.12.1w, >= 16.9.1d, >= 17.3.1, >= 16.9.4c, >= 16.7.1, >= 17.2.1, >= 16.6.8, >= 16.9.1b, >= 16.9.2s, >= 16.12.4, >= 16.12.3a, >= 17.1.1s, >= 16.11.1a, >= 16.7.2
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Cisco IOS XE Software and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
CWE-388