What’s Vulnerable › Vulnerabilities

CVE-2025-52496

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-07-04 · updated 2026-06-17
• Weakness: CWE-733

Description

Mbed TLS before 3.6.4 has a race condition in AESNI detection if certain compiler optimizations occur. An attacker may be able to extract an AES key from a multithreaded program, or perform a GCM forgery.

Affected products

• mbedtls: before 3.6.4 — fixed in 3.6.4

How to fix

Upgrade to a fixed version: mbedtls 3.6.4. Check the vendor advisory for mitigations.

References

• https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-1.md
• https://lists.debian.org/debian-lts-announce/2025/08/msg00013.html
• https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-1.md

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