| Name | CVE-2019-20840 |
| Description | An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libvncserver (PTS) | buster | 0.9.11+dfsg-1.3+deb10u4 | fixed |
| buster (security) | 0.9.11+dfsg-1.3+deb10u5 | fixed |
| bullseye | 0.9.13+dfsg-2+deb11u1 | fixed |
| sid, trixie, bookworm | 0.9.14+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[buster] - libvncserver <not-affected> (Vulnerable code not present)
[stretch] - libvncserver <not-affected> (Vulnerable code not present)
[jessie] - libvncserver <not-affected> (Vulnerable code not present)
https://github.com/LibVNC/libvncserver/commit/0cf1400c61850065de590d403f6d49e32882fd76
Vulnerable code is introduced with the fix for CVE-2017-18922.