CVE-2019-20840
Fixed in a distro release EPSS 3%
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.
Products: libvnc_project libvncserver, canonical ubuntu_linux, debian_linux, siemens simatic_itc1500_firmware, siemens simatic_itc1500_pro_firmware, siemens simatic_itc1900_firmware, siemens simatic_itc1900_pro_firmware, siemens simatic_itc2200_firmware, siemens simatic_itc2200_pro_firmware, opensuse leap
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | libvncserver | 0.9.13+dfsg-1 |
| Debian 13 | libvncserver | 0.9.13+dfsg-1 |
| Debian 14 | libvncserver | 0.9.13+dfsg-1 |
| SUSE Enterprise Storage 5 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE HPE Helion OpenStack 8 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP1 | LibVNCServer | 0.9.10-4.22.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP2 | LibVNCServer | 0.9.10-4.22.1 |
| SUSE Linux Enterprise Server 12 SP2-BCL | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server 12 SP2-LTSS | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server 12 SP3-BCL | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server 12 SP3-LTSS | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server 12 SP4-LTSS | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server 12 SP5 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE Linux Enterprise Workstation Extension 15 SP1 | LibVNCServer | 0.9.10-4.22.1 |
| SUSE Linux Enterprise Workstation Extension 15 SP2 | LibVNCServer | 0.9.10-4.22.1 |
| SUSE OpenStack Cloud 7 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE OpenStack Cloud 8 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE OpenStack Cloud 9 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE OpenStack Cloud Crowbar 8 | LibVNCServer | 0.9.9-17.31.1 |
| SUSE OpenStack Cloud Crowbar 9 | LibVNCServer | 0.9.9-17.31.1 |
| Ubuntu 14.04 LTS | x11vnc | no fix |
| Ubuntu 16.04 LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.5 |
| Ubuntu 18.04 LTS | libvncserver | 0.9.11+dfsg-1ubuntu1.3 |
| Ubuntu 20.04 LTS | libvncserver | 0.9.12+dfsg-9ubuntu0.2 |
| Ubuntu 20.04 LTS | veyon | no fix |
| Ubuntu 22.04 LTS | veyon | no fix |
| Ubuntu 24.04 LTS | veyon | no fix |
| Ubuntu 25.10 | veyon | no fix |
| Ubuntu 26.04 LTS | veyon | no fix |
| Ubuntu 26.10 | veyon | no fix |
| openSUSE Leap 15.1 | LibVNCServer | 0.9.10-lp151.7.9.1 |
| openSUSE Leap 15.2 | LibVNCServer | 0.9.10-lp152.9.8.1 |
| openSUSE Leap 15.2 | LibVNCServer | 0.9.10-lp152.9.4.2 |