USN-5212-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. Original advisory details: It was discovered that the Apache HTTP Server incorrectly handled certain forward proxy requests. A remote attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly perform a Server Side Request Forgery attack. (CVE-2021-44224) It was discovered that the Apache HTTP Server Lua module incorrectly handled memory in the multipart parser. A remote attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-44790)
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