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Fencer Intel
medium 5.4

CVE-2026-20122 kev in the critical feed json

Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability

published 8mo ago modified 4mo ago also EUVD-2026-8673

cvss
5.4
version 3.1, CNA
cisa kev
Exploited
added 2026-04-20
epss
25.8%
EPSS 25.8% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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.

Patch / fix

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.

  • cisco catalyst_sd-wan_manager 20.9.8.2, 20.12.5.3, 20.15.4.2, 20.18.2.1

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Timeline

  1. Published
  2. CISA SSVC: exploitation active
  3. Added to CISA KEV
  4. CISA patch deadline

Known exploited

Added
6mo ago
Patch by
2026-04-23 (6mo ago)
Ransomware
Not known
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.
Vendor, product
Cisco, Catalyst SD-WAN Manger
CISA name
Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
8mo ago

Exploit prediction

25.80% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected products

  • Cisco Cisco Catalyst SD-WAN Manager

Classification

Weakness
  • CWE-648 Incorrect Use of Privileged APIs

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.