CVE-2019-15690: libvnc libvncserver Heap-based Buffer Overflow

Vulnerability summary

CVE-2019-15690 is a high (CVSS 8.8) Heap-based Buffer Overflow vulnerability in libvnc libvncserver. EPSS estimates a 0.75% chance of exploitation in the next 30 days, higher than 53.9% of scored vulnerabilities.

Timeline

1. 24-01-2025
   PublishedVulnerability first disclosed.
2. 24-01-2025
   Last modifiedVulnerability information updated.

Description

LibVNCServer 0.9.12 release and earlier contains heap buffer overflow vulnerability within the HandleCursorShape() function in libvncclient/cursor.c. An attacker sends cursor shapes with specially crafted dimensions, which can result in remote code execution.

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().