CVE-2024-3913Network attack vector

Service interruption via boot-time firewall race

Published Aug 13, 2024 · Updated Jan 29, 2025

Authentication bypass in Phoenix Contact CHARX SEC-3xxx firmware before 1.7.0 allows remote attackers to change device configuration. Incorrect startup ordering exposes an internal configuration service before the firewall starts, leaving a configuration file remotely writable during a short boot window. Exploitation requires network reachability during device startup, and the resulting configuration change can interrupt controller availability.

CVSS severity5.9
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Phoenix Contact CHARX SEC-3xxx firmware before 1.7.0 allows remote attackers to change device configuration. Incorrect startup ordering exposes an internal configuration service before the firewall starts, leaving a configuration file remotely writable during a short boot window. Exploitation requires network reachability during device startup, and the resulting configuration change can interrupt controller availability.

The record

CVE
CVE-2024-3913
Published
Aug 13, 2024
Updated
Jan 29, 2025
Vendor
Phoenix Contact
Product
CHARX SEC-3100
Classifications
CWE-552, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2025Record 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=0.0.0 <1.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Phoenix Contact · CHARX SEC-3100version=0.0.0 <1.7.0
Phoenix Contact · CHARX SEC-3150version=0.0.0 <1.7.0
Phoenix Contact · CHARX SEC-3050version=0.0.0 <1.7.0
Phoenix Contact · CHARX SEC-3000version=0.0.0 <1.7.0

Published CVSS scores

7.5Phoenix ContactCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9CERT VDECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3NIST NVDCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-552Files or Directories Accessible to External Parties
T1565.001Stored Data Manipulation

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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