Add README.md

Author: r4j0x00

CVE-2021-22600/README.md

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+# CVE-2021-22600
+
+This Proof-Of-Concept demonstrates the exploitation of [CVE-2021-22600](https://github.com/advisories/GHSA-6rrc-7vqp-364c).
+
+## Usage
+
+```sh
+$ gcc -static -o exploit exploit.c
+$ ./exploit
+```