ID:5246 - Exploit for NULL pointer dereference in OpenSSL - CVE-2021-3449

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Main Vulnerability Database Exploits ID:5246 - Exploit for NULL pointer dereference in OpenSSL - CVE-2021-3449

ID:5246 - Exploit for NULL pointer dereference in OpenSSL - CVE-2021-3449

Published: March 26, 2021


Vulnerability identifier: #VU51733
Vulnerability risk: Medium
CVE-ID: CVE-2021-3449
CWE-ID: CWE-476
Exploitation vector: Remote access
Vulnerable software:
OpenSSL

Link to public exploit:


Vulnerability description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error when processing TLSv1.2 renegotiations. A remote attacker can send a maliciously crafted renegotiation ClientHello message, which omits the signature_algorithms extension but includes a signature_algorithms_cert extension, trigger a NULL pointer dereference error and crash the server.

Remediation

Install update from vendor's website.