CVE-2023-39908Network attack vector

Process-memory disclosure via unchecked metadata length

Published Aug 14, 2023 · Updated Oct 9, 2024

Out-of-bounds read in Yubico YubiHSM 2 SDK 2023.01 allows remote authenticated users to disclose process memory via PKCS11 metadata reads. The PKCS11 populate_template() function fails to validate lengths for specific object-metadata reads and can return up to 8192 bytes of previously used stack memory. An authenticated YubiHSM2 session is required; secrets stored in the HSM are not exposed, but calling applications can receive uninitialized memory.

CVSS severity7.5
High
EPSS probability0.57%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in Yubico YubiHSM 2 SDK 2023.01 allows remote authenticated users to disclose process memory via PKCS11 metadata reads. The PKCS11 populate_template() function fails to validate lengths for specific object-metadata reads and can return up to 8192 bytes of previously used stack memory. An authenticated YubiHSM2 session is required; secrets stored in the HSM are not exposed, but calling applications can receive uninitialized memory.

The record

CVE
CVE-2023-39908
Published
Aug 14, 2023
Updated
Oct 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS: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-125Out-of-bounds Read
T1005Data from Local System

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo