CVE-2026-20122KEV · OVERDUECWE-648

Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability

Medium · published February 25, 2026

Patch now

The score understates this — it's already being exploited

CVSS calls it medium at 5.4. It is confirmed in active exploitation. It sits in the 98.0th percentile for exploit probability.

183
days past CISA
deadline
CVSS v3.1
5.4
EPSS
25%
Percentile
98.0
In the wild
Confirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.25476 · 98.0th percentile
Weakness
CWE-648 · Incorrect Use of Privileged APIs
Published
2026-02-25T16:14Z
KEV added
2026-04-20 · due 2026-04-23
EPSS history
Timeline
  • 20 APR 00:00Z
    Added to CISA KEV — remediate by Apr 23
    kev
  • 25 FEB 16:14Z
    Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
    cvelistv5