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CVE-2023-39908

HIGH
7.5
CVSS Score
Published: August 14, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 06:12 AM UTC
1 product affected across 1 vendorYubihsm 2 SDK

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
PoC

Description

The PKCS11 module of the YubiHSM 2 SDK through 2023.01 does not properly validate the length of specific read operations on object metadata. This may lead to disclosure of uninitialized and previously used memory.

Affected

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

Yubihsm 2 SDK· Yubico
95%
v < 2023.08
Affected range stops below 2023.08, 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 (2)

Source: [email protected]
https://blog.inhq.net/posts/yubico-yubihsm-pkcs-vuln/
PatchVendor Advisory
Source: [email protected]
https://www.yubico.com/support/security-advisories/ysa-2023-01/

SSVC — Action Prioritization

SSVCPoCAutomatablePartial 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
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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