CVE-2025-49087

MEDIUM

Published Jul 20, 2025 Modified Aug 7, 2025 CWE-385

Description

In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an attacker to recover the plaintext when PKCS#7 padding mode is used.

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CVSS v3.1 Score

4.0

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

Weakness Type (CWE)

CWE-385 CWE-385

Affected Products

Vendor	Product	Versions
arm	mbed_tls	3.6.1 — 3.6.4

References

Advisories & Patches

https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

Exploits

https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-5.md

Frequently Asked Questions

What is CVE-2025-49087? +

In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an attacker to recover the plaintext when PKCS#7 padding mode is used. It has a CVSS v3.1 base score of 4.0 (MEDIUM).

How severe is CVE-2025-49087? +

CVE-2025-49087 has a CVSS v3.1 score of 4.0 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-49087? +

CVE-2025-49087 affects products from arm, specifically: mbed_tls. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-49087? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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