CVE-2026-9625Network attack vector

Service crash via oversized CIP embedded message

Published Sep 1, 2026 · Updated Sep 1, 2026

Buffer overflow in Rockwell Automation RSLinx Classic 4.50 and earlier allows remote attackers to crash the service via a crafted CIP packet. CIP embedded-message processing copies attacker-controlled data without validating its size against the destination buffer. No authentication or user interaction is required, and recovery requires restarting the service; no confidentiality or integrity impact is reported.

CVSS severity8.7
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Rockwell Automation RSLinx Classic 4.50 and earlier allows remote attackers to crash the service via a crafted CIP packet. CIP embedded-message processing copies attacker-controlled data without validating its size against the destination buffer. No authentication or user interaction is required, and recovery requires restarting the service; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2026-9625
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
Rockwell Automation
Product
RSLinx Classic
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 2026Record 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=V4.50 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rockwell Automation · RSLinx Classicversion=V4.50 and prior

Published CVSS scores

7.5CISACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7Rockwell AutomationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation Flood

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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