CVE-2024-45157

Side-channel exposure via ignored DRBG selection

Published Sep 5, 2024 · Updated Mar 14, 2025

Algorithm-selection failure in Mbed TLS since 2.26.0 allows local users to target the PSA subsystem's weaker side-channel resistance. The MBEDTLS_PSA_HMAC_DRBG_MD_TYPE option is documented as selecting HMAC_DRBG, but the PSA initialization path ignores it and selects CTR_DRBG whenever MBEDTLS_CTR_DRBG_C is enabled. Exposure requires that compile-time combination and a platform where software AES leaks useful timing or power information; random output quality remains cryptographically acceptable.

CVSS severity5.1
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Algorithm-selection failure in Mbed TLS since 2.26.0 allows local users to target the PSA subsystem's weaker side-channel resistance. The MBEDTLS_PSA_HMAC_DRBG_MD_TYPE option is documented as selecting HMAC_DRBG, but the PSA initialization path ignores it and selects CTR_DRBG whenever MBEDTLS_CTR_DRBG_C is enabled. Exposure requires that compile-time combination and a platform where software AES leaks useful timing or power information; random output quality remains cryptographically acceptable.

The record

CVE
CVE-2024-45157
Published
Sep 5, 2024
Updated
Mar 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-696
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 14, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.1CISA ADPCVSS:3.1/AV:L/AC:H/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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-696Incorrect Behavior Order

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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