Exploited vulnerability · CISA KEV

Is CVE-2026-20122 exploited? Yes: in CISA KEV since 20 Apr 2026

Gociux · Cisco Catalyst SD-WAN Manger · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-20122, Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 20 Apr 2026, 54 days after it was published. It affects Cisco Catalyst SD-WAN Manger. If you run it, CISA's required action is: 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.

What it is

Cisco Catalyst SD-WAN Manager contains an incorrect use of privileged APIs vulnerability 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.

What to do

1. Check whether you run it. Look for Catalyst SD-WAN Manger in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
2. Apply the fix. 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.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 25 Feb 2026.
4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

References

• www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt
• sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwa
• nvd.nist.gov/vuln/detail/CVE-2026-20122

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2026 · Cisco scorecard · act-now radar.