CVE-2021-1507: Cisco SD-WAN vManage API Stored Cross-Site Scripting Vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-06 · updated 2026-06-17
Weakness: CWE-79

Description

A vulnerability in an API of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against users of the application web-based interface. This vulnerability exists because the API does not properly validate user-supplied input. An attacker could exploit this vulnerability by sending malicious input to the API. A successful exploit could allow the attacker to execute arbitrary script code in the context of the web-based interface or access sensitive, browser-based information.

Affected products

Cisco Sd-Wan Vmanage: before 20.5.1 — fixed in 20.5.1

How to fix

Upgrade to a fixed version: Cisco Sd-Wan Vmanage 20.5.1. Check the vendor advisory for mitigations.

References

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