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CVE-2026-16816

IBM AIX, PowerVM VIOS, vios

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.

CVSS
9.9
EPSS
0.49%
40.0% percentile
CISA KEV
Not listed
Published
2026.08.20
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.49%
Technical severityCVSS 9.9

Vulnerability overview

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.

Affected product and versions

Product
IBM AIX, PowerVM VIOS, vios
Affected versions
>= 7.2, >= 7.3, >= 4.1, >= 4.1.0 < 4.1.0.50, >= 4.1.1.0 < 4.1.1.30, >= 4.1.2.0 < 4.1.2.20, >= 7.2.5 <= 7.2.5.212, >= 7.3.2 <= 7.3.2.5, >= 7.3.3 <= 7.3.3.2, >= 7.3.4 <= 7.3.4.1
Fixed versions
4.1.0.50, 4.1.1.30, 4.1.2.20

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that IBM AIX, PowerVM VIOS, vios and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-78