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CVE-2026-20122

medium

Description

A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system. This vulnerability is due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.

References

https://www.securityweek.com/recent-cisco-catalyst-sd-wan-vulnerability-now-widely-exploited/

https://www.theregister.com/2026/03/06/cisco_sdwan_bugs/

https://securityaffairs.com/189056/security/cisco-flags-ongoing-exploitation-of-two-recently-patched-catalyst-sd-wan-flaws.html

https://www.securityweek.com/cisco-warns-of-more-catalyst-sd-wan-flaws-exploited-in-the-wild/

https://www.helpnetsecurity.com/2026/03/05/cisco-cve-2026-20128-cve-2026-20122-exploited/

https://www.bleepingcomputer.com/news/security/cisco-flags-more-sd-wan-flaws-as-actively-exploited-in-attacks/

https://thehackernews.com/2026/03/cisco-confirms-active-exploitation-of.html

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v

Details

Source: Mitre, NVD

Published: 2026-02-25

Updated: 2026-03-04

Risk Information

CVSS v2

Base Score: 5.5

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

Severity: Medium

CVSS v3

Base Score: 5.4

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

Severity: Medium

EPSS

EPSS: 0.00034

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