EUVD-2026-63720
GHSA-5xv4-9g3c-88fq
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable unauthenticated overflow (AV:N/PR:N/UI:N) with full RCE impact, but reliable stack-overflow exploitation against AIX mitigations justifies AC:H rather than IBM's AC:L.
Primary rating from Vendor (us).
CVSS VectorVendor: us
Lifecycle Timeline
2DescriptionCVE.org
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a stack buffer overflow.
AnalysisAI
Remote code execution in IBM AIX 7.2 and 7.3 (and IBM PowerVM VIOS 4.1) stems from a stack-based buffer overflow that lets a remote attacker overwrite memory and run arbitrary code on the host. IBM PSIRT rated it CVSS 9.8, and the vector indicates network-reachable, unauthenticated exploitation requiring no user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker needs network reachability to the affected AIX 7.2/7.3 or VIOS 4.1 service that processes the malicious input; per the CVSS vector no authentication (PR:N) and no user interaction (UI:N) are required. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, base 9.8) describes a worst-case profile: network-reachable, low complexity, no privileges, no user interaction, with full confidentiality, integrity, and availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Patch available per vendor advisory: apply the fixes referenced in IBM's security bulletin at https://www.ibm.com/support/pages/node/7283858, which for AIX and VIOS is typically delivered as interim fixes (iFixes) or Technology Level/Service Pack updates for AIX 7.2, AIX 7.3, and VIOS 4.1 - apply the exact iFix listed there after verifying your current oslevel, since the input does not include a specific fix version to cite. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all AIX 7.2, 7.3, and PowerVM VIOS 4.1 systems in the environment and isolate affected hosts to trusted networks only; establish a war room to track patch availability from IBM PSIRT. …
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Same weakness CWE-787 – Out-of-bounds Write
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External POC / Exploit Code
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