Is CVE-2026-20263 being actively exploited?

CVE-2026-20263 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-20263?

CVE-2026-20263 has a CVSS 3.1 base score of 8.6 (HIGH).

CVE-2026-20263

HIGH · CVSS 8.6EPSS 0.6%EU EUVD

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.

Key facts

CVSS score: 8.6 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness (CWE): CWE-388
EPSS score: 0.6% (46th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-53452)
Published: August 5, 2026
NVD last modified: September 28, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-53452 in the EU Vulnerability Database. Last updated in EUVD on August 5, 2026.

View on the EU Vulnerability Database

Affected products

cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe

and 217 more…

Certified products that may be affected

11 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Cisco Embedded Services 9300 and 3300 Series Switches (ESS9300 & ESS3300) running IOS-XE 17.15 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11662-2026 - active
Cisco Catalyst 8000V Edge (C8000V) running IOS-XE 17.15 - Cisco Systems, Inc. - Common Criteria Certificate Number: 2025/161 - active
Cisco 1000 Series Integrated Services Routers (C1100), Cisco Catalyst IR1800 Rugged Series Routers (IR1800), Cisco Catalyst IR8300 Rugged Series Routers (IR8300) running IOS-XE 17.15 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11643-2025 - active
Cisco Catalyst Industrial Ethernet 9300 Rugged Series Switches running IOS-XE 17.15 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11603-2025 - active
Cisco Aggregation Services Router 1000 Series (ASR1K), Cisco Catalyst 8200, 8300, 8500 Series Edge Routers (Cat8K) running IOS-XE version 17.15 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-11642-2025 - active

See all 11 in the Security Certifications Explorer.

References

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

Last updated September 30, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain