CVE-2024-20383Network attack vector

Authenticated browser script execution via unvalidated input

Published May 15, 2024 · Updated Aug 8, 2025

Stored XSS in Cisco Secure Email and Web Manager allows remote authenticated users to execute script in another interface user's browser. The AsyncOS web management interface insufficiently validates user input, allowing attacker-supplied content to persist and run in the interface context. A crafted link and user interaction are required; exploitation exposes sensitive browser-based information or permits actions in that context.

CVSS severity4.8
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Cisco Secure Email and Web Manager allows remote authenticated users to execute script in another interface user's browser. The AsyncOS web management interface insufficiently validates user input, allowing attacker-supplied content to persist and run in the interface context. A crafted link and user interaction are required; exploitation exposes sensitive browser-based information or permits actions in that context.

The record

CVE
CVE-2024-20383
Published
May 15, 2024
Updated
Aug 8, 2025
Vendor
ClamAV
Product
Cisco Secure Email and Web Manager
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.8.1-002
  2. Affected versionversion=12.8.1-021
  3. Affected versionversion=13.0.0-277
  4. Affected versionversion=13.6.2-078
  5. Affected versionversion=13.8.1-068
  6. Affected versionversion=13.8.1-074
  7. Affected versionversion=13.8.1-108
  8. Affected versionversion=14.0.0-404
  9. Affected versionversion=14.1.0-227
  10. Affected versionversion=14.2.0-212
  11. Affected versionversion=14.2.0-224
  12. Affected versionversion=14.3.0-120
  13. Affected versionversion=15.0.0-334

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Secure Email and Web Managerversion=12.8.1-002; version=12.8.1-021; version=13.0.0-277; version=13.6.2-078; version=13.8.1-068; version=13.8.1-074; version=13.8.1-108; version=14.0.0-404; version=14.1.0-227; version=14.2.0-212; version=14.2.0-224; version=14.3.0-120; version=15.0.0-334

Published CVSS scores

4.8Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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