EUVD-2026-62705
GHSA-9gg7-6hv8-w46w
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
MITM/on-path position needed to impersonate the policy server, so AC:H; no auth (PR:N); scope change and traffic tampering give S:C/I:H with limited read (C:L) and no availability impact.
Primary rating from Vendor (ibm).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
Lifecycle Timeline
2DescriptionNVD
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to impersonate the TNC policy server and modify traffic due to improper certificate validation.
AnalysisAI
TNC policy server impersonation in IBM AIX 7.2/7.3 and IBM PowerVM VIOS 4.1 lets a network-positioned attacker forge the Trusted Network Connect policy server and tamper with the traffic between it and the endpoint, because the client fails to properly validate the server's certificate (CWE-295). An attacker who can intercept the session can present a fraudulent certificate, read limited data and alter integrity-critical policy exchanges. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that Trusted Network Connect (TNC) is actually configured and in use between the AIX/VIOS endpoint and a TNC policy server, and that the attacker holds a man-in-the-middle / on-path position on the network path to that server in order to impersonate it and modify traffic. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | IBM rates this 9.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N), driven by the network vector, no-privilege/no-interaction requirement, scope change and high integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has gained an on-path position on the segment between an AIX or VIOS endpoint and its TNC policy server presents a forged certificate that the client accepts due to the validation flaw. Posing as the legitimate policy server, the attacker manipulates the posture/policy exchange - for example approving a non-compliant endpoint or altering returned instructions - and can modify the intercepted traffic. … |
| Remediation | Apply the IBM-provided fix per the vendor advisory at https://www.ibm.com/support/pages/node/7283858 (patch available per vendor advisory); consult that page for the specific AIX 7.2/7.3 and VIOS 4.1 APAR or ifix levels, as exact patched version strings were not included in the input 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 IBM PowerVM VIOS 4.1 systems in your environment and identify their current patch levels. …
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Same weakness CWE-295 – Improper Certificate Validation
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External POC / Exploit Code
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