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CVE-2021-34598

Phoenix Contact: FL MGUARD lack of memory release in remote logging functionality

HIGH
7.5
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
HIGH7.5
Exploit prediction
EPSS 0.9%

Description

In Phoenix Contact FL MGUARD 1102 and 1105 in Versions 1.4.0, 1.4.1 and 1.5.0 the remote logging functionality is impaired by the lack of memory release for data structures from syslog-ng when remote logging is active

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

7.5HIGHCERTVDE
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-401

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