What is CVE-2026-20122?

CVE-2026-20122 is a medium-severity vulnerability in Cisco Catalyst Sd-Wan Manager, classified under CWE-648. CVSS score: 5.4/10. Published 2026-02-25.

How severe is CVE-2026-20122?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2026-20122 known to be exploited?

Yes. CVE-2026-20122 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-20), indicating it is being actively exploited.

Vulnerability in Cisco Catalyst Sd-Wan Manager

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.

EPSS: 0.246 (97.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Cisco Catalyst_sd-wan_manager — versions 20.12.6
Cisco Catalyst Sd-wan Manager — versions 20.1.12, 19.2.1, 18.4.4

Weakness classification (CWE)

CWE-648

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-04-20. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-04-23.

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.

References

psirt@cisco.com (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2026-20122?: CVE-2026-20122 is a medium-severity vulnerability in Cisco Catalyst Sd-Wan Manager, classified under CWE-648. CVSS score: 5.4/10. Published 2026-02-25.
How severe is CVE-2026-20122?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2026-20122 known to be exploited?: Yes. CVE-2026-20122 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-20), indicating it is being actively exploited.