CVE-2021-23841

CVE-2021-23841 is described in connected advisories as a NULL pointer dereference in OpenSSL’s X509_issuer_and_serial_hash() when parsing the issuer field. This can crash a process if certificates from untrusted sources are processed and the issuer parsing fails, enabling a potential denial of se...

CVE-2020-1971

CVE-2020-1971 is described across multiple connected sources as a NULL-dereference in OpenSSL’s GENERAL_NAME_cmp when EDIPARTYNAME is present, potentially enabling a denial-of-service crash. Affected OpenSSL versions include all 1.1.1 and 1.0.2 lines; fixes are published in OpenSSL 1.1.1i and Ope...

CVE-2020-1967

CVE-2020-1967 describes a NULL pointer dereference in OpenSSL’s SSL_check_chain() during or after a TLS 1.3 handshake, caused by incorrect handling of the signature_algorithms_cert extension. A malicious peer sending an invalid/unrecognized signature algorithm can crash the server/client, enablin...

CVE-2021-3449

CVE-2021-3449 affects OpenSSL 1.1.1.x where a TLSv1.2 server may crash (DoS) if it receives a renegotiation ClientHello that omits the signature_algorithms extension but includes signature_algorithms_cert. The issue is a NULL pointer dereference leading to a denial of service; OpenSSL clients are...

CVE-2021-23840

CVE-2021-23840 describes an integer-length overflow in EVP_CipherUpdate, EVP_EncryptUpdate, and EVP_DecryptUpdate that can cause a negative output length value when input length is near the platform’s integer limit. This can lead to application crashes or incorrect behavior. Affected OpenSSL rele...

CVE-2021-3450

CVE-2021-3450 affects OpenSSL 1.1.1h–1.1.1j where a bug in the X509_V_FLAG_X509_STRICT path overwrote a prior CA-check result, bypassing the non-CA certificates prohibition unless a programmed purpose is used. When a purpose is configured, the certificate chain is still rejected; the issue is fix...

CVE-2021-23839

CVE-2021-23839 describes a padding-check logic error in OpenSSL 1.0.2 (affecting 1.0.2s–1.0.2x) where RSA_padding_check_SSLv23() mis-handles SSLv2 rollback protection. The bug causes a server configured for SSLv2 in combination with newer TLS versions to accept connections when a version-rollback...