High severity · published Aug 5, 2026
CVE-2026-20263
Cisco IOS XE Software Blocks Extensible Exchange Protocol Denial of Service Vulnerability
8.6
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IX
IOS XE · Cisco
16.6.2; 16.6.3; 16.6.4; 16.6.4a; 16.6.4s; 16.6.5; +34 more · source: NVD
CI
Cisco IOS XE Software · Cisco
17.2.1a; 16.12.1y; 16.12.3s; 16.7.1b; 16.6.2; 16.6.5; +34 more · source: vendor
Affected product
IX
IOS XE
Cisco
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