CVE-2021-34582Network attack vector

Protected-setting modification via stored certificate-file XSS

Published Nov 10, 2021 · Updated Sep 16, 2024

Stored XSS in Phoenix Contact FL MGUARD 1102 and 1105 1.4.0 through 1.5.0 allows remote authenticated users to modify protected settings. The upload path embeds certificate-file contents into the LDAP or remote-logging management page without neutralizing HTML, causing a browser to render supplied markup. Exploitation requires Admin or Super Admin upload privileges and an authenticated user to view an affected page, enabling setting changes under that viewer's identity.

CVSS severity4.8
Medium
EPSS probability0.29%
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 Phoenix Contact FL MGUARD 1102 and 1105 1.4.0 through 1.5.0 allows remote authenticated users to modify protected settings. The upload path embeds certificate-file contents into the LDAP or remote-logging management page without neutralizing HTML, causing a browser to render supplied markup. Exploitation requires Admin or Super Admin upload privileges and an authenticated user to view an affected page, enabling setting changes under that viewer's identity.

The record

CVE
CVE-2021-34582
Published
Nov 10, 2021
Updated
Sep 16, 2024
Vendor
Phoenix Contact
Product
FL MGUARD
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=1.4.0 <FL MGUARD 1102 (No. 1153079)*
  2. Affected versionversion=1.4.0 <FL MGUARD 1105 (No. 1153078)*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Phoenix Contact · FL MGUARDversion=1.4.0 <FL MGUARD 1102 (No. 1153079)*; version=1.4.0 <FL MGUARD 1105 (No. 1153078)*

Published CVSS scores

4.8CERT VDECVSS: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

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Your stack

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