CVE-2025-41707Public exploitNetwork attack vector

WebSocket service interruption via oversized JSON key

Published Oct 14, 2025 · Updated Oct 14, 2025

Buffer overflow in Phoenix Contact QUINT4-UPS EIP before VC:07 allows remote attackers to interrupt its WebSocket service. The /ws/quint handler accepts a JSON pingpong message containing a 133,337-byte key, and the published CWE identifies an unchecked buffer copy. No authentication or user interaction is required; triggering the flaw interrupts the affected service while core UPS functionality remains available.

CVSS severity5.3
Medium
EPSS probability1.41%
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

Buffer overflow in Phoenix Contact QUINT4-UPS EIP before VC:07 allows remote attackers to interrupt its WebSocket service. The /ws/quint handler accepts a JSON pingpong message containing a 133,337-byte key, and the published CWE identifies an unchecked buffer copy. No authentication or user interaction is required; triggering the flaw interrupts the affected service while core UPS functionality remains available.

The record

CVE
CVE-2025-41707
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
Phoenix Contact
Product
QUINT4-UPS/24DC/24DC/20/EIP
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2025Record 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=VC:00 <VC:07

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Phoenix Contact · QUINT4-UPS/24DC/24DC/20/EIPversion=VC:00 <VC:07
Phoenix Contact · QUINT4-UPS/24DC/24DC/5/EIPversion=VC:00 <VC:07
Phoenix Contact · QUINT4-UPS/24DC/24DC/40/EIPversion=VC:00 <VC:07
Phoenix Contact · QUINT4-UPS/24DC/24DC/10/EIPversion=VC:00 <VC:07

Published CVSS scores

5.3CERT@VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

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