EUVD-2026-63646
GHSA-xfxq-w327-fmf9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-accessible service accepts unauthenticated input that triggers recursive crash; impact is pure availability loss with no confidentiality or integrity consequences.
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 uncontrolled recursion.
AnalysisAI
Denial of service via uncontrolled recursion affects IBM AIX 7.2, 7.3 and IBM PowerVM VIOS 4.1, enabling a remote unauthenticated attacker to crash affected systems with no authentication or user interaction required. The CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) reflects low attack complexity and a fully network-exploitable path, making opportunistic or targeted disruption feasible against any exposed instance. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (AV:N/AC:L/PR:N/UI:N) indicates no special configuration prerequisites - remote unauthenticated exploitation is possible against any network-reachable IBM AIX 7.2, AIX 7.3, or PowerVM VIOS 4.1 instance running the affected service. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) presents a straightforward, unauthenticated, low-complexity denial-of-service profile. … 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 | IBM has released a patch for CVE-2026-17121, available through the IBM support portal at https://www.ibm.com/support/pages/node/7283858. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of systems running IBM AIX 7.2, 7.3, or PowerVM VIOS 4.1 and determine which instances are exposed to untrusted networks; prioritize any that host critical business functions. …
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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