CVE-2026-20263
Cisco IOS XE Software Blocks Extensible Exchange Protocol Denial of Service Vulnerability
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-388 |
| Vendor | cisco |
| Product | cisco ios xe software |
| Ecosystems | |
| Industries | NetworkingTelecommunications |
| Published | Aug 5, 2026 |
| Last Updated | Aug 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Cisco / Cisco IOS XE Software
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 16.11.1b 16.9.1s 16.9.3h 16.9.1c 16.6.5a 16.6.3 16.10.1f 17.2.1v 16.8.1e 16.9.3a 16.12.1a 16.12.1x 16.6.4s 16.10.1c 16.12.3 16.11.2 16.6.5b 16.12.2s 16.10.1b 16.7.3 16.6.7 16.9.6 16.9.2 16.10.1 16.12.1t 16.9.1 16.8.1a 16.9.3s 16.6.7a 16.12.2 16.11.1 16.9.3 16.11.1s 16.12.1 17.1.1 17.1.2 16.10.1d 17.1.1t 16.9.4 16.8.3 16.12.2t 16.9.5 16.8.1s 16.10.1e 16.8.2 16.6.4 16.8.1b 16.10.1a 16.12.1z 16.8.1c 16.9.1a 16.9.5f 16.6.4a 16.10.1g 16.8.1 16.6.6 16.9.2a 16.8.1d 16.10.3 16.7.1a 16.11.1c 16.10.1s 17.2.1r 17.1.1a 16.10.2 16.12.2a 16.12.1c 16.12.1s 16.7.4 17.2.2 16.9.8 16.9.7 17.1.3 17.3.1a 17.3.2a 16.12.5 17.3.1w 17.3.2 17.4.1 16.12.4a 17.4.1a 17.3.1x 17.3.3 16.6.9 17.2.3 17.5.1 16.12.1z1 16.12.5a 17.4.1b 17.3.1z 16.12.5b 17.4.2 17.3.3a 17.3.5 17.3.4 17.5.1a 16.12.6 17.6.1 16.12.1z2 16.6.10 17.3.4a 17.6.1a 17.7.1 17.6.1x 17.6.2 16.12.6a 17.3.4c 17.4.2a 17.3.4b 17.7.1a 16.12.7 17.8.1a 17.6.3a 17.6.3 17.7.2 17.7.1b 17.9.1w 17.3.5a 17.6.1z 16.12.8 17.8.1 17.9.1 17.6.4 17.3.5b 17.9.1a 17.3.6 17.10.1 16.9.8a 17.6.1z1 17.10.1a 17.9.2 17.6.5 17.9.1x 17.9.1y 16.9.8b 17.3.7 17.9.2a 17.9.3 16.12.9 17.11.1 17.10.1b 17.6.6 17.9.1x1 17.11.1a 17.9.3a 17.12.1 17.3.8 17.9.4 16.12.10 17.12.1w 17.9.1y1 17.12.1a 17.9.5 17.13.1 17.12.1x 17.12.2 17.14.1 17.9.4a 17.3.8a 17.6.6a 17.6.5a 17.6.7 16.12.10a 17.15.1 17.13.1a 17.12.2a 16.12.11 17.12.3 17.12.1y 17.12.1z 17.9.5a 17.14.1a 17.9.5b 17.6.8 16.12.12 17.12.4 17.9.6 17.17.1 17.16.1 17.15.1w 17.12.3a 17.9.5c 17.15.1a 17.12.1z1 17.15.2 17.15.1b 17.9.5d 17.15.1x 17.9.6a 17.12.1z2 17.6.8a 17.16.1a 16.12.13 17.15.3 17.9.7 17.12.5 17.15.1y 17.9.5e 17.12.4a 17.15.2a 17.15.2c 17.15.2b 17.12.1z3 17.9.5f 17.12.4b 17.12.5a 17.18.1 17.12.6 17.12.1z4 17.9.8 17.9.7a 17.15.3a 17.15.4 17.12.5b 17.15.3b 16.12.14 17.18.1z 17.9.7b 17.12.5c 26.1.1 17.18.1a 17.15.4a 17.18.2 17.18.1w 17.15.4b 17.12.6a 17.12.7 17.15.4c 17.9.9 17.12.5d 16.12.15 17.15.4s1 17.15.5 17.12.1z5 17.18.1x 17.12.1z6 17.15.4d 17.12.6b 17.4.1c 17.15.5a 17.18.1y 17.12.7a 17.18.3 17.12.7b 17.18.3a 26.1.1a 26.2.1ea