#VU106011 Improper authentication in mbed TLS - CVE-2025-27810

Vulnerability identifier: #VU106011

Vulnerability risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-27810

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
mbed TLS
Universal components / Libraries / Libraries used by multiple products

Vendor: ARM

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when handling memory allocations during TLS handshake. A remote attacker with ability to trigger memory allocation failures or cryptographic hardware failures can impersonate a legitimate peer by tampering with handshake messages.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

mbed TLS: 2.7.18 - 2.7.19, 2.16.9 - 2.16.12, 2.25.0 - 2.28.9, 3.0.0, 3.1.0, 3.2.0, 3.2.1, 3.3.0, 3.4.0, 3.4.1, 3.5.0 - 3.5.2, 3.6.0 - 3.6.2

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External links
https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-2.28.10
https://github.com/ARMmbed/mbedtls/releases/tag/mbedtls-3.6.3
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-2/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.