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CVE-2020-1967 is a NULL pointer dereference in OpenSSL's SSL_check_chain() processing during or after a TLS 1.3 handshake. Incorrect handling of the signature_algorithms_cert TLS extension allows an invalid or unrecognized peer-supplied signature algorithm to reach a dereferenced NULL value. OpenSSL 1.1.1d through 1.1.1f are affected; releases before 1.1.1d are not affected.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (PoC) exploit for CVE-2020-1967, a denial-of-service vulnerability in OpenSSL versions 1.1.1d, 1.1.1e, and 1.1.1f. The exploit is implemented as a patch to the OpenSSL source code (CVE-2020-1967.patch), which modifies the client to send a specially crafted signature_algorithms_cert TLS extension containing an invalid algorithm value. When this payload is sent to a vulnerable OpenSSL server configured to invoke SSL_check_chain() during a TLS 1.3 handshake (such as with the -x options in s_server), it triggers a segmentation fault, crashing the server. The README.md provides detailed setup and usage instructions, including example commands for configuring the server and sending the exploit. The repository is structured with a single patch file for the exploit and a README for documentation. No detection scripts or fake code are present; the repository is a functional PoC for the described vulnerability.
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A High severity security vulnerability affecting some versions of OpenSSL.
A high-severity NULL pointer dereference vulnerability in OpenSSL's SSL_check_chain() during or after a TLS 1.3 handshake that can allow a malicious peer to cause a denial of service crash.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.