#VU112444 Out-of-bounds read in mbed TLS - CVE-2025-52497

Vulnerability identifier: #VU112444

Vulnerability risk: Medium

CVSSv4.0: 6.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-52497

CWE-ID: CWE-125

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 gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when parsing invalid PEM-encrypted material in mbedtls_pk_parse_key(), mbedtls_pk_parse_keyfile() and mbedtls_pem_read_buffer() functions. A remote attacker can pass specially crafted data to the application, trigger an out-of-bounds read error and read contents of memory on the system or perform a denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

mbed TLS: 3.0.0, 3.1.0, 3.2.0, 3.2.1, 3.3.0, 3.4.0, 3.4.1, 3.5.0, 3.5.1, 3.5.2, 3.6.0, 3.6.1, 3.6.2, 3.6.3

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External links
https://github.com/Mbed-TLS/mbedtls-docs/blob/main/security-advisories/mbedtls-security-advisory-2025-06-2.md

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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.