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CVE-2021-3345

How to build vulnerable libgcrypt

git clone --single-branch --branch LIBGCRYPT-1.9-BRANCH https://dev.gnupg.org/source/libgcrypt.git
cd libgcrypt
git checkout aa3f595341eb
./autogen.sh
./configure --enable-maintainer-mode && make

How to use exploit

make
./main

This vulnerability is not really interesting, because most distros use an older version of libgcrypt so they are not vulnerable. There is a possibilty this can be reproduced on other software that uses libgcrypt as a dependency.