CVE-2025-20303Network attack vector

Authenticated script execution via reflected interface input

Published Nov 5, 2025 · Updated Nov 5, 2025

Reflected XSS in Cisco Identity Services Engine allows remote authenticated users to execute scripts in an interface user's browser. Specific management-interface pages reflect insufficiently validated user-supplied input into responses, causing a viewer's browser to interpret injected code as script. A low-privileged device account and user interaction are required; exploitation exposes browser-based information and permits actions in that interface context.

CVSS severity5.4
Medium
EPSS probability3.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Cisco Identity Services Engine allows remote authenticated users to execute scripts in an interface user's browser. Specific management-interface pages reflect insufficiently validated user-supplied input into responses, causing a viewer's browser to interpret injected code as script. A low-privileged device account and user interaction are required; exploitation exposes browser-based information and permits actions in that interface context.

The record

CVE
CVE-2025-20303
Published
Nov 5, 2025
Updated
Nov 5, 2025
Vendor
ClamAV
Product
Cisco Identity Services Engine
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 5, 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=3.1.0
  2. Affected versionversion=3.1.0 p1
  3. Affected versionversion=3.1.0 p10
  4. Affected versionversion=3.1.0 p2
  5. Affected versionversion=3.1.0 p3
  6. Affected versionversion=3.1.0 p4
  7. Affected versionversion=3.1.0 p5
  8. Affected versionversion=3.1.0 p6
  9. Affected versionversion=3.1.0 p7
  10. Affected versionversion=3.1.0 p8
  11. Affected versionversion=3.1.0 p9
  12. Affected versionversion=3.2.0
  13. Affected versionversion=3.2.0 p1
  14. Affected versionversion=3.2.0 p2
  15. Affected versionversion=3.2.0 p3
  16. Affected versionversion=3.2.0 p4
  17. Affected versionversion=3.2.0 p5
  18. Affected versionversion=3.2.0 p6
  19. Affected versionversion=3.2.0 p7
  20. Affected versionversion=3.3.0
  21. Affected versionversion=3.3 Patch 1
  22. Affected versionversion=3.3 Patch 2
  23. Affected versionversion=3.3 Patch 3
  24. Affected versionversion=3.3 Patch 4
  25. Affected versionversion=3.3 Patch 5
  26. Affected versionversion=3.3 Patch 6
  27. Affected versionversion=3.3 Patch 7
  28. Affected versionversion=3.4.0
  29. Affected versionversion=3.4 Patch 1
  30. Affected versionversion=3.4 Patch 2
  31. Affected versionversion=3.4 Patch 3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Identity Services Engineversion=3.1.0; version=3.1.0 p1; version=3.1.0 p10; version=3.1.0 p2; version=3.1.0 p3; version=3.1.0 p4; version=3.1.0 p5; version=3.1.0 p6; version=3.1.0 p7; version=3.1.0 p8; version=3.1.0 p9; version=3.2.0; version=3.2.0 p1; version=3.2.0 p2; version=3.2.0 p3; version=3.2.0 p4; version=3.2.0 p5; version=3.2.0 p6; version=3.2.0 p7; version=3.3.0; version=3.3 Patch 1; version=3.3 Patch 2; version=3.3 Patch 3; version=3.3 Patch 4; version=3.3 Patch 5; version=3.3 Patch 6; version=3.3 Patch 7; version=3.4.0; version=3.4 Patch 1; version=3.4 Patch 2; version=3.4 Patch 3

Published CVSS scores

5.4Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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