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CVE-2023-32690

Responder can Invoke Undefined Behavior in libspdm Requester

HIGH
7.5
CVSS Score
Published: June 1, 2023 at 04:15 PM UTC
Updated: June 17, 2026 at 05:59 AM UTC
1 product affected across 1 vendorLibspdm

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

libspdm is a sample implementation that follows the DMTF SPDM specifications. Prior to versions 2.3.3 and 3.0, following a successful CAPABILITIES response, a libspdm Requester stores the Responder's CTExponent into its context without validation. If the Requester sends a request message that requires a cryptography operation by the Responder, such as CHALLENGE, libspdm will calculate the timeout value using the Responder's unvalidated CTExponent. A patch is available in version 2.3.3. A workaround is also available. After completion of VCA, the Requester can check the value of the Responder's CTExponent. If it greater than or equal to 64, then the Requester can stop communication with the Responder.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libspdm· Dmtf
95%
v < 2.3.3
Affected range stops below 2.3.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/DMTF/libspdm/issues/2068
x_refsource_MISCPatch
Source: [email protected]
https://github.com/DMTF/libspdm/pull/2069
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/DMTF/libspdm/security/advisories/GHSA-56h8-4gv5-jf2c

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20NVD-CWE-noinfo

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