EUVD-2026-62423
GHSA-hvmr-4fv5-38xw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Network-exposed registration service with no auth (PR:N, AV:N); path traversal write is straightforward (AC:L); no confidentiality loss, but arbitrary file overwrite yields High integrity and Low availability impact.
Primary rating from Vendor (ibm).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Lifecycle Timeline
2DescriptionNVD
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 's nimesis registration service could allow a remote attacker to overwrite files due to path traversal.
AnalysisAI
Unauthenticated remote file overwrite in IBM AIX 7.2/7.3 and PowerVM VIOS 4.1 is possible via the nimesis registration service, which fails to sanitize path traversal sequences in client-supplied input. An attacker with network access to the nimesis service can write arbitrary content to locations outside the intended directory, potentially overwriting sensitive system files such as cron jobs, init scripts, or authentication databases. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The nimesis registration service must be running and reachable over the network from the attacker's position - this service is part of the NIM subsystem and is typically active on AIX systems configured as NIM clients. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.2 High rating is well-grounded for this class of vulnerability: AV:N/AC:L/PR:N/UI:N means any network-reachable instance is exploitable by an unauthenticated attacker with minimal effort. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network access to a vulnerable AIX or VIOS host sends a crafted registration request to the nimesis service, embedding path traversal sequences (e.g., '../../etc/cron.d/backdoor') in a filename parameter. The service writes attacker-controlled content to the traversed path without validation, planting a malicious cron entry or overwriting a PAM configuration file. … |
| Remediation | IBM has released a patch, available through the vendor advisory at https://www.ibm.com/support/pages/node/7283858. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit network firewall rules to identify and restrict all inbound access to the nimesis registration service to trusted administrative systems only, and create an inventory of all AIX 7.2, 7.3, and PowerVM VIOS 4.1 systems in your environment. …
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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