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CVE-2021-34582

Phoenix Contact: FL MGUARD XSS through web-based management and REST API

MEDIUM
4.8
CVSS Score
Published: November 10, 2021 at 11:22 AM UTC
Updated: June 17, 2026 at 03:56 AM UTC
5 products affected across 1 vendorFl Mguard 1102 FirmwareFl Mguard 1105 FirmwareFl Mguard 1105

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.3%

Description

In Phoenix Contact FL MGUARD 1102 and 1105 in Versions 1.4.0, 1.4.1 and 1.5.0 a user with high privileges can inject HTML code (XSS) through web-based management or the REST API with a manipulated certificate file.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fl Mguard 1102 Firmware· Phoenix Contact
95%
1.4.01.4.11.5.0
phoenixcontact-fl-mguard-1102 (same device)
Fl Mguard 1105 Firmware· Phoenix Contact
95%
1.4.01.4.11.5.0
phoenixcontact-fl-mguard-1105 (same device)
mGuard· Phoenix Contact
60%
1.4.0 ≤ v < FL MGUARD 1102 (No. 1153079)*1.4.0 ≤ v < FL MGUARD 1105 (No. 1153078)*1.4.0
Affected range stops below FL MGUARD 1102 (No. 1153079)*, so it looks safe — our inference, not a vendor statement
Affected range stops below FL MGUARD 1105 (No. 1153078)*, so it looks safe — our inference, not a vendor statement
Fl Mguard 1102· Phoenix Contactdevice
80%
All versions
Fl Mguard 1105· Phoenix Contactdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://cert.vde.com/en/advisories/VDE-2021-046/

CVSS

4.8MEDIUMCERTVDE
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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