EUVD-2026-63384
GHSA-3r89-cmcr-wvp2
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-delivered IPsec packets require no authentication; integer underflow in decapsulation yields availability-only impact with no scope change.
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 an improper calculation of a memory offset during IPsec decapsulation.
AnalysisAI
Denial of service in IBM AIX 7.2/7.3 and PowerVM VIOS 4.1 is achievable by unauthenticated remote attackers who send crafted IPsec packets that trigger an integer underflow (CWE-191) during decapsulation, causing an improper memory offset calculation that crashes the affected system. The CVSS vector confirms network-accessible, zero-authentication exploitation with low complexity, yielding a full availability impact with no confidentiality or integrity exposure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target system must have IPsec configured and actively processing inbound IPsec traffic - the flaw is triggered during decapsulation, so it requires the system to be operating as an IPsec endpoint (tunnel or transport mode). … 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:N/I:N/A:H places this vulnerability in the highest-accessibility tier for a DoS class finding: fully remote, unauthenticated, low complexity, and no user interaction required. … 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 per the vendor advisory at https://www.ibm.com/support/pages/node/7283858; administrators should consult that page for the specific APAR or fileset fix applicable to their AIX 7.2, AIX 7.3, or PowerVM VIOS 4.1 level, as exact fixed version numbers are not independently derivable from the available intelligence data. … 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 classify them by business criticality and production status. …
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Same weakness CWE-191 – Integer Underflow
View allSame technique Integer Overflow
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External POC / Exploit Code
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