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Vulnerability of OpenSSL: NULL pointer dereference via X509_issuer_and_serial_hash

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via X509_issuer_and_serial_hash() of OpenSSL, in order to trigger a denial of service.
Vulnerable systems: Debian, OpenSSL, stunnel, Ubuntu, VxWorks.
Severity of this threat: 2/4.
Creation date: 16/02/2021.
Références of this weakness: CERTFR-2021-AVI-124, CVE-2021-23841, DLA-2563-1, DLA-2565-1, DSA-4855-1, USN-4738-1, USN-4745-1, VIGILANCE-VUL-34598.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via X509_issuer_and_seri...
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This computer weakness impacts software or systems such as Debian, OpenSSL, stunnel, Ubuntu, VxWorks.

Our Vigil@nce team determined that the severity of this vulnerability note is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this cybersecurity threat.

Solutions for this threat 

Fixes for this vulnerability are not yet public.
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