Vulnerability in Cisco iOS Xe Software
CVE-2026-20263
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Cisco iOS Xe Software — versions 17.2.1a, 16.12.1y, 16.12.3s
- Cisco iOS Xe — versions 16.10.1, 16.10.1a, 16.10.1b
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20263?
- CVE-2026-20263 is a high-severity vulnerability in Cisco iOS Xe Software, classified under CWE-388. CVSS score: 8.6/10. Published 2026-08-05.
- How severe is CVE-2026-20263?
- High severity. CVSS v3 base score is 8.6 out of 10.