CVE-2021-1486: Cisco Catalyst SD-WAN Manager

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

A vulnerability in Cisco SD-WAN vManage Software could allow an unauthenticated, remote attacker to enumerate user accounts. This vulnerability is due to the improper handling of HTTP headers. An attacker could exploit this vulnerability by sending authenticated requests to an affected system. A successful exploit could allow the attacker to compare the HTTP responses that are returned by the affected system to determine which accounts are valid user accounts.

Affected products

• Cisco Catalyst SD-WAN Manager: from 20.4, before 20.4.1 (fixed in 20.4.1)
• Cisco SD-WAN Vmanage: before 20.3.3 (fixed in 20.3.3)

Published 2021-05-06. Last modified 2026-06-17.