Exploited vulnerability · CISA KEV

Is CVE-2025-20393 exploited? Yes: in CISA KEV since 17 Dec 2025

Gociux · Cisco Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-20393, Cisco Multiple Products Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 17 Dec 2025, the day it was published. It affects Cisco Multiple Products. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What it is

Cisco Secure Email Gateway, Secure Email, AsyncOS Software, and Web Manager appliances contains an improper input validation vulnerability that allows threat actors to execute arbitrary commands with root privileges on the underlying operating system of an affected appliance.

What to do

1. Check whether you run it. Look for Multiple Products in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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 17 Dec 2025.
4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

References

• nvd.nist.gov/vuln/detail/CVE-2025-20393

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 December 2025 · Cisco scorecard · act-now radar.