CVE-2026-20128
Published 2026-02-25 · Updated 2026-06-17 · Source psirt@cisco.com
Summary
CVE-2026-20128 is a high-severity (CVSS 7.5) vulnerability in Cisco Catalyst SD-WAN Manager. CISA added it to the Known Exploited Vulnerabilities catalog on April 20, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 23, 2026. CISA does not currently list it as used in ransomware campaigns. Cisco has 102 vulnerabilities in the KEV catalog, 7 of them linked to ransomware.
All 102 known-exploited Cisco vulnerabilities →Description
A vulnerability in the Data Collection Agent (DCA) feature of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain DCA user privileges on an affected system. This vulnerability is due to the presence of a credential file for the DCA user on an affected system. An attacker could exploit this vulnerability by sending a crafted HTTP request and reading the file that contains the DCA password from that affected system. A successful exploit could allow the attacker to access another affected system and gain DCA user privileges. Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability.
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Cisco — Catalyst SD-WAN Manager
Name: Cisco Catalyst SD-WAN Manager Storing Passwords in a Recoverable Format Vulnerability
Date added: 2026-04-20 · Due: 2026-04-23
Required action: Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.