CVE-2023-20041Network attack vector

Stored script execution via unvalidated data fields

Published Nov 1, 2023 · Updated Nov 21, 2024

Stored XSS in Cisco Firepower Management Center's web interface allows remote attackers to execute script in a user's browser. The interface stores crafted input inserted into multiple data fields without sufficient validation, then renders it in the management context. Exploitation requires a user to view the stored content; script runs with that user's interface context and can read browser-based information or temporarily disrupt parts of the dashboard.

CVSS severity4.8
Medium
EPSS probability0.39%
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 Firepower Management Center's web interface allows remote attackers to execute script in a user's browser. The interface stores crafted input inserted into multiple data fields without sufficient validation, then renders it in the management context. Exploitation requires a user to view the stored content; script runs with that user's interface context and can read browser-based information or temporarily disrupt parts of the dashboard.

The record

CVE
CVE-2023-20041
Published
Nov 1, 2023
Updated
Nov 21, 2024
Vendor
ClamAV
Product
Cisco Firepower Management Center
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 2024Record 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=6.4.0.16
  2. Affected versionversion=6.6.7.1
  3. Affected versionversion=7.0.5
  4. Affected versionversion=7.1.0.3
  5. Affected versionversion=7.2.0
  6. Affected versionversion=7.2.0.1
  7. Affected versionversion=7.2.1
  8. Affected versionversion=7.2.2
  9. Affected versionversion=7.2.3
  10. Affected versionversion=7.2.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Firepower Management Centerversion=6.4.0.16; version=6.6.7.1; version=7.0.5; version=7.1.0.3; version=7.2.0; version=7.2.0.1; version=7.2.1; version=7.2.2; version=7.2.3; version=7.2.3.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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