Vulnerability identifier: #VU50736

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
wolfSSL
Universal components / Libraries / Libraries used by multiple products

Vendor: wolfSSL

Description
The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due memory leak with TLS 1.3 authenticated-only ciphers when TLS 1.3 early data is enabled. A section of the server hello could contains 16 bytes of uninitialized data when sent to the connected peer. A remote attacker can gain access to potentially sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

wolfSSL: 4.0 - 4.6.0

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External links
http://github.com/wolfSSL/wolfssl/releases/tag/v4.7.0-stable

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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.