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CriticalKEV

CVE-2025-20393 — Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability

CVE-2025-20393 · Cisco Secure Email · CVSS 10 · KEV

In brief

Severity · CVSS
Critical10CVSS 3.1, Critical
EPSS
32%
CISA KEV
Known exploited, listed since 17 Dec 2025
Vendor
Cisco
Published · Modified
·
Last verified

Summary

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.

Weakness: CWE-20

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

19 branches without a precise fixed release

Cisco Secure Email

Source: CVE-2025-20393cisco-sa-sma-attack-N9bf4

  1. 16.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  2. 15.5
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  3. 15.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  4. 14.3
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  5. 14.2
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  6. 14.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  7. 13.5
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  8. 13.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed

The vendor states fixes are available; the releases per branch are in its advisory.

Cisco Secure Email and Web Manager

Source: CVE-2025-20393cisco-sa-sma-attack-N9bf4

  1. 16.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  2. 15.5
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  3. 15.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  4. 14.3
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  5. 14.2
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  6. 14.1
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  7. 14.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  8. 13.8
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  9. 13.6
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  10. 13.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  11. 12.8
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed

The vendor states fixes are available; the releases per branch are in its advisory.

Remediation

Fix available

Vendor fix

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-sma-attack-N9bf4· revised 15 Jan 2026

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-sma-attack-N9bf4

CISA KEV required action

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 due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2025-AVI-1120

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Added to CISA KEV on 17 Dec 2025

Federal remediation due date: 24 Dec 2025

The CISA required action is shown under Remediation.

32% probability of exploitation in the next 30 days (percentile 98%).

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

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2025-AVI-1120Published 18 Dec 2025

Vulnerability in Cisco products

Remote arbitrary code execution

Summary

A vulnerability has been discovered in Cisco products. It allows an attacker to trigger remote arbitrary code execution with administrator privileges. Cisco indicates that this vulnerability is being actively exploited and provides recommendations in its security bulletin.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:04 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Added to CISA KEV
  2. Published by the source
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-sma-attack-N9bf4

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained