CVE-2024-20534Network attack vector

Stored XSS via unvalidated web UI input

Published Nov 6, 2024 · Updated Nov 6, 2024

Stored XSS in Cisco IP phones with Multiplatform Firmware allows remote authenticated users to execute script in the web UI. The web UI stores malicious code injected into specific interface pages without properly validating the supplied input, then renders it in another user's browser. Exploitation requires device Admin credentials, enabled Web Access, and interaction by a user; Web Access is disabled by default.

CVSS severity4.8
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Cisco IP phones with Multiplatform Firmware allows remote authenticated users to execute script in the web UI. The web UI stores malicious code injected into specific interface pages without properly validating the supplied input, then renders it in another user's browser. Exploitation requires device Admin credentials, enabled Web Access, and interaction by a user; Web Access is disabled by default.

The record

CVE
CVE-2024-20534
Published
Nov 6, 2024
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco Session Initiation Protocol (SIP) Software
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 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=3.0(1)
  2. Affected versionversion=3.1(1)
  3. Affected versionversion=3.1(1)SR1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ClamAV · Cisco Session Initiation Protocol (SIP) Softwareversion=3.0(1); version=3.1(1); version=3.1(1)SR1
ClamAV · Cisco IP Phones with Multiplatform Firmwareversion=11.0.0; version=11.0.1; version=11.0.1 MSR1-1; version=11.0.2; version=11.1.1; version=11.1.1 MSR1-1; version=11.1.1 MSR2-1; version=11.1.2; version=11.1.2 MSR1-1; version=11.1.2 MSR3-1; version=11.2.1; version=11.2.2; version=11.2.3; version=11.2.3 MSR1-1; version=11.2.4; version=11.3.1; version=11-3-1MPPSR4UPG; version=11.3.1 MSR1-3; version=11.3.1 MSR2-6; version=11-3-1MSR2UPG; version=11.3.1 MSR3-3; version=11.3.1 MSR4-1; version=11.3.2; version=11.3.3; version=11.3.3 MSR1; version=11.3.3 MSR2; version=11.3.4; version=11.3.5; version=11.3.6; version=11.3.6SR1; version=11.3.7; version=11.3.7SR1; version=11.3.7SR2; version=12.0.1; version=12.0.2; version=12.0.3; version=12.0.3SR1; version=12.0.3SR2; version=12.0.4; version=12.0.4SR1; version=12.0.5; version=12.0.5SR1; version=4.6 MSR1; version=4.7.1; version=4.8.1; version=4.8.1 SR1; version=5.0.1; version=5.1.1

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo