CVE-2026-20224: Cisco Catalyst SD-WAN Manager XML External Entity Injection Vulnerability

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-14 · updated 2026-10-26
Weakness: CWE-20

Description

A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an unauthenticated, remote attacker to read arbitrary files that are stored in an affected system. The attacker does not need to have valid user credentials. This vulnerability is due to improper handling of XML External Entity (XXE) entries when parsing an XML file. An attacker could exploit this vulnerability by sending a crafted request to an affected system. A successful exploit could allow the attacker to read arbitrary files that are stored in the affected system.

Affected products

Cisco Catalyst SD-WAN Manager: before 20.9.9.1; from 20.10 before 20.12.5.4; from 20.12.6 before 20.12.6.2; from 20.13 before 20.15.4.4; from 20.15.5 before 20.15.5.2; from 20.16 before 20.18.2.2 — fixed in 20.9.9.1, 20.12.5.4, 20.12.6.2, 20.15.4.4, 20.15.5.2, 20.18.2.2

How to fix

Upgrade to a fixed version: Cisco Catalyst SD-WAN Manager 20.9.9.1, 20.12.5.4, 20.12.6.2, 20.15.4.4. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-20224 or the next vulnerability affects your stack