CVE-2023-31127

Authentication bypass via handshake mode switching

Published May 8, 2023 · Updated Jan 28, 2025

Authentication bypass in DMTF libspdm before 2.3.2 allows remote authenticated users to establish an SPDM responder session. The FINISH and PSK_FINISH handlers accept completion for the opposite handshake mode because they do not verify session_info->use_psk before completing the session. Exploitation requires adjacent access to a responder that enables DHE and PSK simultaneously with mutual authentication; requesters and other responder configurations are unaffected.

CVSS severity9.0
Critical
EPSS probability0.94%
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 DMTF libspdm before 2.3.2 allows remote authenticated users to establish an SPDM responder session. The FINISH and PSK_FINISH handlers accept completion for the opposite handshake mode because they do not verify session_info->use_psk before completing the session. Exploitation requires adjacent access to a responder that enables DHE and PSK simultaneously with mutual authentication; requesters and other responder configurations are unaffected.

The record

CVE
CVE-2023-31127
Published
May 8, 2023
Updated
Jan 28, 2025
Vendor
DMTF
Product
libspdm
Classifications
CWE-372
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 2025Record 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=< 2.3.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

DMTF · libspdmversion=< 2.3.2

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-372Incomplete Internal State Distinction

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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