CVE-2025-41426Network attack vector

Authenticated code execution via unbounded REQUEST_METHOD copy

Published May 21, 2025 · Updated May 21, 2025

Stack overflow in Vertiv Liebert RDU101 1.9.0.0 and earlier and IS-Unity 8.4.1.0 and earlier allows remote authenticated users to execute code. The pldproxyweb request handler uses sprintf to copy the attacker-controlled REQUEST_METHOD, URI_Request, and sessACT strings into a stack buffer without a length limit. Access requires an authenticated web session; overflowing REQUEST_METHOD can overwrite the return pointer and redirect execution on the communications card.

CVSS severity9.3
Critical
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Vertiv Liebert RDU101 1.9.0.0 and earlier and IS-Unity 8.4.1.0 and earlier allows remote authenticated users to execute code. The pldproxyweb request handler uses sprintf to copy the attacker-controlled REQUEST_METHOD, URI_Request, and sessACT strings into a stack buffer without a length limit. Access requires an authenticated web session; overflowing REQUEST_METHOD can overwrite the return pointer and redirect execution on the communications card.

The record

CVE
CVE-2025-41426
Published
May 21, 2025
Updated
May 21, 2025
Vendor
Vertiv
Product
Liebert IS-Unity Communications Card
Classifications
CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2025CVE publishedPublication date reported by the CVE source.
  2. May 21, 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 <=8.4.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vertiv · Liebert IS-Unity Communications Cardversion=0 <=8.4.1.0
Vertiv · Liebert IntelliSlot RDU101 Communications Cardversion=0 <=1.9.0.0

Published CVSS scores

9.8ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3ICS-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit 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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