EUVD-2026-63388
GHSA-8h6m-ghgx-4vjf
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable with no auth or interaction; impact is availability-only (DoS via heap corruption), matching provided vector exactly.
Primary rating from Vendor (ibm).
CVSS VectorVendor: ibm
Lifecycle Timeline
2DescriptionCVE.org
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to cause a denial of service due to a heap-based buffer overflow.
AnalysisAI
Denial of service via heap-based buffer overflow affects IBM AIX 7.2 and 7.3 and IBM PowerVM VIOS 4.1, exploitable by remote unauthenticated attackers. The CVSS vector (AV:N/AC:L/PR:N/UI:N) confirms no authentication or user interaction is required, making this a low-friction remote availability attack against IBM Power Systems infrastructure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication is required and no user interaction is needed, per the CVSS vector PR:N/UI:N/AC:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 score and AV:N/AC:L/PR:N/UI:N vector establish this as a high-priority availability threat: remotely reachable, low complexity, and requiring no credentials or user interaction. … 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 | A vendor-released patch is available from IBM; consult the advisory at https://www.ibm.com/support/pages/node/7283858 for fix details and installation instructions. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all IBM AIX 7.2, 7.3, and PowerVM VIOS 4.1 systems and assess network exposure, particularly those accessible from the internet or untrusted networks. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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