CVE-2026-20262
Published 2026-06-15 · Updated 2026-07-24 · Source psirt@cisco.com
Summary
CVE-2026-20262 is a medium-severity (CVSS 6.5) vulnerability in Cisco Catalyst SD-WAN Manager. CISA added it to the Known Exploited Vulnerabilities catalog on June 15, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by June 29, 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 web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system. This vulnerability exists because the affected software does not properly validate user-supplied input during a file upload process. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected API endpoint of the affected system. A successful exploit could allow the attacker to create or overwrite any file on the underlying operating system. This file could later be used to elevate to root. To exploit this vulnerability, the attacker must have valid credentials with at least a lower-privileged, single-task user account.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CISA Known-Exploited Vulnerability
Product: Cisco — Catalyst SD-WAN Manager
Name: Cisco Catalyst SD-WAN Manager Directory or Path Traversal Vulnerability
Date added: 2026-06-15 · Due: 2026-06-29
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.