QID 357333

a null pointer dereference flaw was found in openssl.
A remote attacker, able to control the arguments of the general_name_cmp function, could cause the application, compiled with openssl to crash resulting in a denial of service.
The highest threat from this vulnerability is to system availability. (
( CVE-2020-1971) calls to evp_cipherupdate, evp_encryptupdate and evp_decryptupdate may overflow the output length argument in some cases where the input length is close to the maximum permissible length for an integer on the platform.
In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative.
This could cause applications to behave incorrectly or crash. (
( CVE-2021-23840) the openssl public api function x509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an x509 certificate.
However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed).
This may subsequently result in a null pointer deref and a crash leading to a potential denial of service attack. (
( CVE-2021-23841) a flaw was found in openssl.
A server crash and denial of service attack could occur if a client sends a tlsv1.2 renegotiation clienthello and omits the signature_algorithms extension but includes a signature_algorithms_cert extension.
( CVE-2021-3449) a flaw was found in openssl.
The highest threat from this vulnerability is to data confidentiality and integrity.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.