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CVE-2026-20122: Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability

criticalknown exploitedCVE-2026-20122
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Cisco Catalyst SD-WAN Manager contains an incorrect use of privileged APIs vulnerability 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.

CSIRTS triage

vendor: Ciscoproduct: Catalyst SD-WAN ManagerPrivilege escalationOther
What
An incorrect use of privileged APIs vulnerability allows an attacker to overwrite arbitrary files and gain vmanage user privileges.
Who is affected
Deployments of Cisco Catalyst SD-WAN Manager.
Urgency
Remediation is urgent due to the critical severity and confirmed exploitation of this vulnerability.
Action
Upgrade to the fixed software as indicated in the advisory.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-04-20
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-20122

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-20122coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Cisco Catalyst SD-WAN

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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