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CVE-2026-20263

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

HIGH
8.6
CVSS Score
Published: August 5, 2026 at 04:18 PM UTC
Updated: October 23, 2026 at 09:10 PM UTC
1 product affected across 1 vendorIOS Xe

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Severity
HIGH8.6
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xe· Cisco
95%
16.10.116.10.1a16.10.1b16.10.1c16.10.1d16.10.1e16.10.1f16.10.1g16.10.1s16.10.216.10.316.11.116.11.1a16.11.1b16.11.1c16.11.1s16.11.216.12.116.12.1016.12.10a16.12.1116.12.1216.12.1316.12.1416.12.1516.12.1a16.12.1c16.12.1s16.12.1t16.12.1w16.12.1x16.12.1y16.12.1z16.12.1z116.12.1z216.12.216.12.2a16.12.2s16.12.2t16.12.316.12.3a16.12.3s16.12.416.12.4a16.12.516.12.5a16.12.5b16.12.616.12.6a16.12.716.12.816.12.916.6.1016.6.216.6.316.6.416.6.4a16.6.4s16.6.516.6.5a16.6.5b16.6.616.6.716.6.7a16.6.816.6.916.7.116.7.1a16.7.1b16.7.216.7.316.7.416.8.116.8.1a16.8.1b16.8.1c16.8.1d16.8.1e16.8.1s16.8.216.8.316.9.116.9.1a16.9.1b16.9.1c16.9.1d16.9.1s16.9.216.9.2a16.9.2s16.9.316.9.3a16.9.3h16.9.3s16.9.416.9.4c16.9.516.9.5f16.9.616.9.716.9.816.9.8a16.9.8b17.1.117.1.1a17.1.1s17.1.1t17.1.217.1.317.10.117.10.1a17.10.1b17.11.117.11.1a17.12.117.12.1a17.12.1w17.12.1x17.12.1y17.12.1z17.12.1z117.12.1z217.12.1z317.12.1z417.12.1z517.12.1z617.12.217.12.2a17.12.317.12.3a17.12.417.12.4a17.12.4b17.12.517.12.5a17.12.5b17.12.5c17.12.5d17.12.617.12.6a17.12.6b17.12.717.12.7a17.12.7b17.13.117.13.1a17.14.117.14.1a17.15.117.15.1a17.15.1b17.15.1w17.15.1x17.15.1y17.15.217.15.2a17.15.2b17.15.2c17.15.317.15.3a17.15.3b17.15.417.15.4a17.15.4b17.15.4c17.15.4d17.15.4s117.15.517.15.5a17.16.117.16.1a17.17.117.18.117.18.1a17.18.1w17.18.1x17.18.1y17.18.1z17.18.217.18.317.18.3a17.2.117.2.1a17.2.1r17.2.1v17.2.217.2.317.3.117.3.1a17.3.1w17.3.1x17.3.1z17.3.217.3.2a17.3.317.3.3a17.3.417.3.4a17.3.4b17.3.4c17.3.517.3.5a17.3.5b17.3.617.3.717.3.817.3.8a17.4.117.4.1a17.4.1b17.4.1c17.4.217.4.2a17.5.117.5.1a17.6.117.6.1a17.6.1x17.6.1z17.6.1z117.6.217.6.317.6.3a17.6.417.6.517.6.5a17.6.617.6.6a17.6.717.6.817.6.8a17.7.117.7.1a17.7.1b17.7.217.8.117.8.1a17.9.117.9.1a17.9.1w17.9.1x17.9.1x117.9.1y17.9.1y117.9.217.9.2a17.9.317.9.3a17.9.417.9.4a17.9.517.9.5a17.9.5b17.9.5c17.9.5d17.9.5e17.9.5f17.9.617.9.6a17.9.717.9.7a17.9.7b17.9.817.9.926.1.126.1.1a26.2.1ea

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-bing-MGHrFAkd

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGHcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-388

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