Description
LibVNCServer versions 0.9.15 and prior (fixed in commit dc78dee) contain null pointer dereference vulnerabilities in the HTTP proxy handlers within httpProcessInput() in httpd.c that allow remote attackers to cause a denial of service by sending specially crafted HTTP requests. Attackers can exploit missing validation of strchr() return values in the CONNECT and GET proxy handling paths to trigger null pointer dereferences and crash the server when httpd and proxy features are enabled.
References (3)
Core 3
Core References
Vendor Advisory vendor-advisory
https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereference
Scores
CVSS v3
7.5
EPSS
0.0532
EPSS Percentile
91.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-476
Status
published
Products (3)
LibVNC/LibVNCServer
< 0.9.15
LibVNC/LibVNCServer
dc78dee51a7e270e537a541a17befdf2073f5314
libvncserver_project/libvncserver
< 0.9.15
Published
Mar 24, 2026
Tracked Since
Mar 24, 2026