CVE Watch8 oct 2026

CVE-2020-1967

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer d

CVSS

7.5

Alto

EPSS

53.3%

p99

KEV

—

Exploit Today

0-100

Publicado: 21 abr 2020 · Última mod.: 8 oct 2026 · CWE-476

EPSS · 30d

53.3%EPSS · 30 días53.3%

2026-09-212026-10-19

Descripción técnica

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).

Referencias oficiales

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