This update for tightvnc fixes the following issues: - CVE-2019-15679: Fixed a heap buffer overflow in InitialiseRFBConnection which might lead to code execution . - CVE-2019-8287: Fixed a global buffer overflow in HandleCoRREBBPmay which might lead to code execution . - CVE-2019-15680: Fixed a null pointer dereference in HandleZlibBPP which could have led to denial of service . - CVE-2019-15678: Fixed a heap buffer overflow in rfbServerCutText handler .