CVE-2023-34471

Trust-control bypass via incomplete HMAC generation

Published Jul 5, 2023 · Updated Nov 21, 2024

Missing cryptographic step in AMI MegaRAC SP-X 12 before 12.2 allows attackers to subvert BMC trust controls. The BMC generates an HMAC without a required cryptographic step, but AMI has not disclosed the affected routine or omitted operation. Exploitation requires high privileges, adjacent-network access, and user interaction; successful abuse compromises confidentiality, integrity, and authentication.

CVSS severity6.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing cryptographic step in AMI MegaRAC SP-X 12 before 12.2 allows attackers to subvert BMC trust controls. The BMC generates an HMAC without a required cryptographic step, but AMI has not disclosed the affected routine or omitted operation. Exploitation requires high privileges, adjacent-network access, and user interaction; successful abuse compromises confidentiality, integrity, and authentication.

The record

CVE
CVE-2023-34471
Published
Jul 5, 2023
Updated
Nov 21, 2024
Vendor
American Megatrends International
Product
MegaRAC SP-X
Classifications
CWE-325, CAPEC-68, T1553.002
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Jul 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12 <12.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

American Megatrends International · MegaRAC SP-Xversion=12 <12.2

Published CVSS scores

6.3AMICVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-325Missing Cryptographic Step
CAPEC-68Subvert Code-signing Facilities
T1553.002Subvert Trust Controls: Code Signing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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