CVE-2025-25270Network attack vector

Root code execution via source-port firewall bypass

Published Jul 8, 2025 · Updated Jul 8, 2025

Firewall-rule bypass in Phoenix Contact CHARX SEC-3xxx firmware before 1.7.3 allows remote attackers to reach protected interfaces. The firewall configuration filters outbound traffic by source port, allowing crafted traffic to cross an interface boundary that the rules should enforce. No authentication is required, but root code execution requires network adjacency, a specific configuration, and chaining with another vulnerability.

CVSS severity9.8
Critical
EPSS probability0.65%
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

Firewall-rule bypass in Phoenix Contact CHARX SEC-3xxx firmware before 1.7.3 allows remote attackers to reach protected interfaces. The firewall configuration filters outbound traffic by source port, allowing crafted traffic to cross an interface boundary that the rules should enforce. No authentication is required, but root code execution requires network adjacency, a specific configuration, and chaining with another vulnerability.

The record

CVE
CVE-2025-25270
Published
Jul 8, 2025
Updated
Jul 8, 2025
Vendor
Phoenix Contact
Product
CHARX SEC-3100
Classifications
CWE-913, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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=0.0.0 <1.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Phoenix Contact · CHARX SEC-3100version=0.0.0 <1.7.3
Phoenix Contact · CHARX SEC-3150version=0.0.0 <1.7.3
Phoenix Contact · CHARX SEC-3050version=0.0.0 <1.7.3
Phoenix Contact · CHARX SEC-3000version=0.0.0 <1.7.3

Published CVSS scores

9.8CERT VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-913Improper Control of Dynamically-Managed Code Resources
T1210Exploitation of Remote Services

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

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