Risk Letters

Exploited vulnerability

CVE-2025-20393

TLP:CLEAR

Cisco Multiple Products Improper Input Validation Vulnerability

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.

Facts

  • Vendor: Cisco
  • Product: Multiple Products
  • CVSS: 10
  • EPSS (probability of exploitation within 30 days): 32.4 %
  • On CISA's Known Exploited Vulnerabilities list since: 17 December 2025
  • First known exploitation: 17 December 2025
  • CISA's deadline for US federal agencies: 24 December 2025
  • Weakness: CWE-20
  • First seen by Risk Letters: 17 December 2025

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD