DescriptionMultiple heap-based buffer overflows in the ZRLE_DECODE function in common/rfb/zrleDecode.h in TigerVNC before 1.3.1, when NDEBUG is enabled, allow remote VNC servers to cause a denial of service (vncviewer crash) and possibly execute arbitrary code via vectors related to screen image rendering.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severityhigh

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
tigervnc (PTS)stretch1.7.0+dfsg-7+deb9u1fixed
bullseye, sid1.10.1+dfsg-4fixed
vnc4 (PTS)jessie4.1.1+X4.3.0-37.6vulnerable
buster, stretch4.1.1+X4.3.0+t-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
tigervncsource(unstable)(not affected)


- tigervnc <not-affected> (Fixed before initial release in Debian)
may affect related *VNC implementations if built with NDEBUG
e.g. vnc4 seems to have similar code in common/rfb/zrleDecode.h
starting with 4.1.1+X4.3.0+t-1 it's a transitional package

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