CVE-2020-3420Network attack vector

Authenticated stored XSS via insufficient field validation

Published Nov 18, 2024 · Updated Nov 18, 2024

Stored cross-site scripting in Cisco Unified Communications Manager allows remote authenticated users to execute script in another user's browser. The web-based management interface stores malicious data entered in an unspecified field without sufficient validation and later renders it to an interface user. Exploitation requires authenticated access and user interaction; executed script can alter browser-displayed data or expose sensitive browser information.

CVSS severity5.4
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Cisco Unified Communications Manager allows remote authenticated users to execute script in another user's browser. The web-based management interface stores malicious data entered in an unspecified field without sufficient validation and later renders it to an interface user. Exploitation requires authenticated access and user interaction; executed script can alter browser-displayed data or expose sensitive browser information.

The record

CVE
CVE-2020-3420
Published
Nov 18, 2024
Updated
Nov 18, 2024
Vendor
ClamAV
Product
Cisco Unified Communications Manager
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=N/A

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Unified Communications Managerversion=N/A

Published CVSS scores

5.4CiscoCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X

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')
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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