CVE-2023-4857Network attack vector

Information disclosure via unauthorized IPMI calls

Published Apr 15, 2024 · Updated Aug 2, 2024

Authentication bypass in Lenovo SMM/SMM2 and FPC firmware allows remote authenticated users to read limited system information via IPMI. The IPMI authorization path accepts certain calls that the authenticated account should not be permitted to execute; Lenovo has not identified the affected handler or disclosed the validation error. Access to an authenticated enclosure-management account is required, and the documented consequence is limited information disclosure.

CVSS severity7.5
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Lenovo SMM/SMM2 and FPC firmware allows remote authenticated users to read limited system information via IPMI. The IPMI authorization path accepts certain calls that the authenticated account should not be permitted to execute; Lenovo has not identified the affected handler or disclosed the validation error. Access to an authenticated enclosure-management account is required, and the documented consequence is limited information disclosure.

The record

CVE
CVE-2023-4857
Published
Apr 15, 2024
Updated
Aug 2, 2024
Vendor
Lenovo
Product
Lenovo System Management Module Firmware
Classifications
CWE-306
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=1.24 <tesm40b-1.27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Lenovo · Lenovo System Management Module Firmwareversion=1.24 <tesm40b-1.27
Lenovo · Lenovo Fan/Power Controller Module Firmwareversion=0 <fhet62a-3.50

Published CVSS scores

7.5Lenovo Group Ltd.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function

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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