CVE-2026-20122: Cisco Catalyst SD-WAN Manager arbitrary file overwrite via API

CVE-2026-20122 · Severity: critical · CVSS 5.4 · Exploited in the wild · Published 2026-04-20

Cisco Catalyst SD-WAN Manager is a centralized management platform used to configure and monitor enterprise networks. A vulnerability in its programming interface allows an authorized user with basic access to upload files that can overwrite critical system data. If exploited, an attacker could gain elevated administrative control over the management platform, potentially disrupting network operations or accessing sensitive configuration data.

Technologies: Cisco Catalyst SD-WAN Manager. Vendors: Cisco.

Quick answers

Is CVE-2026-20122 exploited in the wild?
Yes. CVE-2026-20122 is known to be exploited in the wild, first recorded on 20 April 2026. Treat it as urgent.
How severe is CVE-2026-20122?
Critical severity, with a CVSS score of 5.4, published 20 April 2026.
Which products and versions are affected?
Cisco Catalyst SD-WAN Manager < 20.9.8.2, 20.10.x < 20.12.5.3, 20.13.x < 20.15.4.2, 20.16.x < 20.18.2.1.
Is there a fix for CVE-2026-20122?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-20122 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-20122?
Check whether you run Cisco Catalyst SD-WAN Manager or Cisco Catalyst Sd-Wan Manger at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A vulnerability in the API interface of Cisco Catalyst SD-WAN Manager (formerly vManage) stems from improper file handling and the incorrect use of privileged APIs (CWE-648). An authenticated, remote attacker with at least read-only credentials and API access can exploit this by uploading malicious files to the local file system. This can lead to an arbitrary file overwrite, allowing the attacker to escalate privileges to the 'vmanage' user level. This vulnerability has been observed being exploited in the wild. Patches are available in versions 20.9.8.2, 20.12.5.3, 20.15.4.2, and 20.18.2.1.

Affected products

  • Cisco Catalyst SD-WAN Manager < 20.9.8.2, 20.10.x < 20.12.5.3, 20.13.x < 20.15.4.2, 20.16.x < 20.18.2.1

Timeline

  • 2026-02-25: disclosed: Initial disclosure by Cisco Systems
  • 2026-04-20: advisory: NVD publication and CISA KEV addition
  • 2026-04-20: kev added: Added to CISA Known Exploited Vulnerabilities catalog
  • 2026-04-20: exploited: Confirmed active exploitation in the wild

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