CVE-2025-36251Network attack vector

Remote command execution via undisclosed nimsh processing

Published Nov 13, 2025 · Updated Nov 13, 2025

Process-control flaws in IBM AIX 7.2 and 7.3 and VIOS 3.1 and 4.1 allow remote attackers to execute commands through nimsh TLS. IBM identifies the nimsh SSL/TLS implementation as the locus but has not disclosed which process operation mishandles network input or how the additional attack vectors work. Exploitation requires network connectivity to the affected host and user interaction, while successful commands can alter data and interrupt services.

CVSS severity9.6
Critical
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Process-control flaws in IBM AIX 7.2 and 7.3 and VIOS 3.1 and 4.1 allow remote attackers to execute commands through nimsh TLS. IBM identifies the nimsh SSL/TLS implementation as the locus but has not disclosed which process operation mishandles network input or how the additional attack vectors work. Exploitation requires network connectivity to the affected host and user interaction, while successful commands can alter data and interrupt services.

The record

CVE
CVE-2025-36251
Published
Nov 13, 2025
Updated
Nov 13, 2025
Vendor
IBM
Product
AIX
Classifications
CWE-114, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 13, 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=7.2
  2. Affected versionversion=7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · AIXversion=7.2; version=7.3
IBM · PowerVM Virtual I/O Serverversion=3.1; version=4.1

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.6IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 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-114Process Control
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

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Your stack

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