CVE-2026-16964Network attack vector

Message interception and reply forgery via information exposure

Published Aug 20, 2026 · Updated Aug 25, 2026

Information exposure in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows remote attackers to intercept messages and forge replies. IBM identifies the affected bos.mp64 fileset but has not disclosed which messaging path exposes sensitive information or how that data enables reply forgery. No authentication or user interaction is required; confidentiality and message integrity are affected, while availability is not.

CVSS severity6.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in IBM AIX 7.2 and 7.3 and PowerVM VIOS 4.1 allows remote attackers to intercept messages and forge replies. IBM identifies the affected bos.mp64 fileset but has not disclosed which messaging path exposes sensitive information or how that data enables reply forgery. No authentication or user interaction is required; confidentiality and message integrity are affected, while availability is not.

The record

CVE
CVE-2026-16964
Published
Aug 20, 2026
Updated
Aug 25, 2026
Vendor
IBM
Product
AIX
Classifications
CWE-200, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=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=4.1

Published CVSS scores

6.5IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A: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 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-200Exposure of Sensitive Information to an Unauthorized Actor
T1557Adversary-in-the-Middle

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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