USN-5051-2 introduced a regression in OpenSSL that affected only Ubuntu 14.04 ESM. This update fix the regression.
Original advisory details:
Ingo Schwarze discovered that OpenSSL incorrectly handled certain ASN.1 strings. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly obtain sensitive information. (CVE-2021-3712)