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CVE-2025-20393

Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability

  • Critical 10.0
  • Exploited: added to CISA KEV 17 Dec 2025

Description

A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to execute arbitrary system commands on an affected device with root privileges. This vulnerability is due to insufficient validation of HTTP requests by the Spam Quarantine feature. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with root privileges.

Key facts

Published
17 Dec 2025
Last changed
7 Oct 2026
Assigned by
cisco
KEV added
17 Dec 2025
KEV fix due
24 Dec 2025
EPSS
32.392% likely to be exploited in the next 30 days, higher than 98.356% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 10.0CVSS 3.1, Criticalfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

What to do

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

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco Secure Email
  • Default status: unknown
  • 14.0.0-698 (affected)
  • 13.5.1-277 (affected)
  • 13.0.0-392 (affected)
  • 14.2.0-620 (affected)
  • 13.0.5-007 (affected)
  • 13.5.4-038 (affected)
  • 14.2.1-020 (affected)
  • 14.3.0-032 (affected)
  • 15.0.0-104 (affected)
  • 15.0.1-030 (affected)
  • 15.5.0-048 (affected)
  • 15.5.1-055 (affected)
  • 15.5.2-018 (affected)
  • 16.0.0-050 (affected)
  • 15.0.3-002 (affected)
  • 16.0.0-054 (affected)
  • 15.5.3-022 (affected)
  • 16.0.1-017 (affected)
CiscoCisco Secure Email and Web Manager
  • Default status: unknown
  • 13.6.2-023 (affected)
  • 13.6.2-078 (affected)
  • 13.0.0-249 (affected)
  • 13.0.0-277 (affected)
  • 13.8.1-052 (affected)
  • 13.8.1-068 (affected)
  • 13.8.1-074 (affected)
  • 14.0.0-404 (affected)
  • 12.8.1-002 (affected)
  • 14.1.0-227 (affected)
  • 13.6.1-201 (affected)
  • 14.2.0-203 (affected)
  • 14.2.0-212 (affected)
  • 12.8.1-021 (affected)
  • 13.8.1-108 (affected)
  • 14.2.0-224 (affected)
  • 14.3.0-120 (affected)
  • 15.0.0-334 (affected)
  • 15.5.1-024 (affected)
  • 15.5.1-029 (affected)
  • 15.5.2-005 (affected)
  • 16.0.0-195 (affected)
  • 15.5.3-017 (affected)
  • 16.0.1-010 (affected)
  • 15.0.1-035 (affected)
  • 16.0.2-088 (affected)

Timeline

  1. 17 Dec 2025 Added to the CISA KEV catalogue
  2. 17 Dec 2025 Published

Weakness

References