CVE-2026-20262

medium

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.

https://www.securityweek.com/cisco-patches-another-sd-wan-zero-day-exploited-in-attacks/

https://www.helpnetsecurity.com/2026/06/16/cisco-sd-wan-cve-2026-20262-exploited/

https://thehackernews.com/2026/06/cisco-releases-security-updates-for.html

https://securityaffairs.com/193693/security/cve-2026-20262-cisco-catalyst-sd-wan-flaw-under-active-targeted-exploitation.html

https://securityaffairs.com/193684/security/u-s-cisa-adds-cisco-catalyst-and-litespeed-cpanel-plugin-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.theregister.com/patches/2026/06/15/cisco-sd-wan-make-me-root-bug-under-attack/5255916

https://www.bleepingcomputer.com/news/security/cisco-fixes-sd-wan-vmanage-flaw-exploited-in-zero-day-attacks/

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfw-c2rZvQ

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20262

Details

Source: Mitre, NVD

Published: 2026-06-15

Updated: 2026-06-16

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:N

Severity: Medium

CVSS v3

Base Score: 6.5

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Severity: Medium

EPSS

EPSS: 0.01741

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics