KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2025-20393

Cisco Secure Email

Cisco / Cisco Secure Email · 14.0.0-698

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Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
29.9%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-20393 is an unauthenticated vulnerability affecting Cisco Cisco Secure Email, Cisco Secure Email and Web Manager. A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Cisco / Cisco Secure Email 14.0.0-698.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Cisco Secure Email

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.

Vendor Product Affected Status
Cisco Cisco Secure Email and Web Manager 14.0.0-404 Affected
Cisco Cisco Secure Email and Web Manager 12.8.1-002 Affected
Cisco Cisco Secure Email and Web Manager 14.1.0-227 Affected
Cisco Cisco Secure Email and Web Manager 13.6.1-201 Affected
Cisco Cisco Secure Email and Web Manager 14.2.0-203 Affected
Cisco Cisco Secure Email and Web Manager 14.2.0-212 Affected
Cisco Cisco Secure Email and Web Manager 12.8.1-021 Affected
Cisco Cisco Secure Email and Web Manager 13.8.1-108 Affected
Cisco Cisco Secure Email and Web Manager 14.2.0-224 Affected
Cisco Cisco Secure Email and Web Manager 14.3.0-120 Affected
Cisco Cisco Secure Email and Web Manager 15.0.0-334 Affected
Cisco Cisco Secure Email and Web Manager 15.5.1-024 Affected
Cisco Cisco Secure Email and Web Manager 15.5.1-029 Affected
Cisco Cisco Secure Email and Web Manager 15.5.2-005 Affected
Cisco Cisco Secure Email and Web Manager 16.0.0-195 Affected
Cisco Cisco Secure Email and Web Manager 15.5.3-017 Affected
Cisco Cisco Secure Email and Web Manager 16.0.1-010 Affected
Cisco Cisco Secure Email and Web Manager 15.0.1-035 Affected
Cisco Cisco Secure Email and Web Manager 16.0.2-088 Affected
Published
17 Dec 2025
Exploitation Reported
01 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa edge

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-20393
  • cisco-sa-sma-attack-N9bf4 sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CVE First 2026-06-01 10:46 UTC
CISA 2026-06-02 14:04 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

29.9%

Weaknesses

Improper Input Validation CWE-20

Timeline

From disclosure to observed exploitation

  1. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  3. CVE published

    Vulnerability disclosed publicly

  4. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-20393

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2025-20393",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.29875,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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