Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability
Cisco — Cisco Catalyst SD-WAN Manager
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.
5.4
7.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Published
- Feb 25, 2026
- Modified
- Apr 21, 2026
- Added to KEV
- Apr 20, 2026
- Federal patch due
- Apr 23, 2026
CISA 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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2026-20122, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2026-20122 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2026-20122?
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.
How severe is CVE-2026-20122?
CVE-2026-20122 has a CVSS base score of 5.4 out of 10 (CVSS 3.1).
Is CVE-2026-20122 actively exploited in the wild?
Yes. CVE-2026-20122 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Apr 20, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-20122?
7.0% - meaning FIRST.org's EPSS model estimates a 7.0% probability this vulnerability will be exploited in the wild within 30 days (93% percentile among all scored CVEs).
What type of vulnerability is CVE-2026-20122?
CVE-2026-20122 is classified under CWE-648 (Incorrect Use of Privileged APIs).
Cross-checked against
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