CVE-2024-27767Network attack vector

Unauthenticated access to PLC control functions

Published Mar 18, 2024 · Updated Aug 2, 2024

Improper authentication in Unitronics UniLogic before 1.35.227 allows remote attackers to bypass access controls on UniStream PLCs. The public CNA, vendor, and researcher materials do not disclose the faulty authentication operation or request that triggers the bypass. Reachability requires network access to a PLC management interface, which is not Internet-exposed by default; full control or code execution requires chaining separate flaws.

CVSS severity10.0
Critical
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Unitronics UniLogic before 1.35.227 allows remote attackers to bypass access controls on UniStream PLCs. The public CNA, vendor, and researcher materials do not disclose the faulty authentication operation or request that triggers the bypass. Reachability requires network access to a PLC management interface, which is not Internet-exposed by default; full control or code execution requires chaining separate flaws.

The record

CVE
CVE-2024-27767
Published
Mar 18, 2024
Updated
Aug 2, 2024
Vendor
Unitronics
Product
UniLogic
Classifications
CWE-287, T0819
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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 <1.35.227
  2. Affected versionversion=All versions <1.35.227

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Unitronics · UniLogicversion=0 <1.35.227; version=All versions <1.35.227

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0Israel National Cyber DirectorateCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 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-287Improper Authentication
T0819Exploit Public-Facing Application

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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