Cisco Multiple Products Improper Input Validation Vulnerability

Technical Severity

CVSS v3.1 Metrics

CRITICAL

10 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

5.65 %

Predictive Probability

Percentile Rank

90.2 th

Documented as more likely to be exploited than 90.2% of known CVEs.

Detection Date

Dec 17, 2025

Remediation Due

Dec 24, 2025

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Asset Context

Vendor Identity

Cisco

Affected Product

Multiple Products

Ransomware Status

Campaign Use Unknown

Weakness Classification

CWE-20

External Intelligence

Please adhere to Cisco's guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible Cisco products affected by this vulnerability. Apply any final mitigations provided by the vendor as soon as they become available. For more information please see:

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2025-20393