CVE-2026-16877: CWE-121 Stack-based Buffer Overflow in IBM AIX
Description
CVE-2026-16877 is a high-severity stack-based buffer overflow vulnerability affecting IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. This flaw could allow a remote authenticated attacker to execute arbitrary code on the affected systems without user interaction.
CVSS v3.1
Score 8.8high
Affected software
IBM
AIX
IBM
PowerVM VIOS
cpe:2.3:a:ibm:aix:7.2:*:*:*:*:*:*:*cpe:2.3:a:ibm:aix:7.2.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:aix:7.3:*:*:*:*:*:*:*cpe:2.3:a:ibm:aix:7.3.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_vios:4.1:*:*:*:*:*:*:*cpe:2.3:a:ibm:powervm_vios:4.1.0:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a stack-based buffer overflow (CWE-121) present in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It enables a remote attacker with authentication privileges to execute arbitrary code by exploiting the overflow condition. The CVSS v3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is provided in the input data.
Potential Impact
Successful exploitation could lead to full compromise of affected systems, including arbitrary code execution with the privileges of the authenticated user. This impacts confidentiality, integrity, and availability of the system.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict remote access to trusted users and monitor for suspicious activity related to this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-07-24T04:41:03.571Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a86e0f8acd9273b49838594
Added to database: 08/20/2026, 11:11:52 UTC
Last enriched: 09/11/2026, 02:16:48 UTC
Last updated: 10/05/2026, 06:48:14 UTC
Views: 45
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.