CVE-2018-20021
Fixed in a distro release EPSS 3%
LibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM
Products: libvnc_project libvncserver, canonical ubuntu_linux, debian_linux
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | libvncserver | 0.9.11+dfsg-1.2 |
| Debian 12 | ssvnc | 1.0.29-5 |
| Debian 12 | tightvnc | 1:1.3.9-9.1 |
| Debian 12 | veyon | 4.1.4+repack1-1 |
| Debian 13 | libvncserver | 0.9.11+dfsg-1.2 |
| Debian 13 | ssvnc | 1.0.29-5 |
| Debian 13 | tightvnc | 1:1.3.9-9.1 |
| Debian 13 | veyon | 4.1.4+repack1-1 |
| Debian 14 | libvncserver | 0.9.11+dfsg-1.2 |
| Debian 14 | ssvnc | 1.0.29-5 |
| Debian 14 | tightvnc | 1:1.3.9-9.1 |
| Debian 8 | italc | 1:2.0.2+dfsg1-2+deb8u1 |
| Debian 8 | libvncserver | 0.9.9+dfsg2-6.1+deb8u4 |
| Debian 8 | ssvnc | 1.0.29-2+deb8u1 |
| Debian 8 | tightvnc | 1.3.9-6.5+deb8u1 |
| Debian 9 | libvncserver | 0.9.11+dfsg-1.3~deb9u1 |
| SUSE Enterprise Storage 4 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Module for Package Hub 15 | LibVNCServer | 0.9.10-4.3.1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | LibVNCServer | 0.9.1-160.6.1 |
| SUSE Linux Enterprise Server 11 SP3-LTSS | LibVNCServer | 0.9.1-160.6.1 |
| SUSE Linux Enterprise Server 11 SP3-TERADATA | LibVNCServer | 0.9.1-160.6.1 |
| SUSE Linux Enterprise Server 11 SP4 | LibVNCServer | 0.9.1-160.6.1 |
| SUSE Linux Enterprise Server 12 SP1-LTSS | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server 12 SP2-BCL | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server 12 SP2-LTSS | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server 12 SP3 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server 12 SP4 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server 12-LTSS | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server for SAP Applications 11 SP4 | LibVNCServer | 0.9.1-160.6.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP1 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Software Development Kit 11 SP4 | LibVNCServer | 0.9.1-160.6.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP3 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP4 | LibVNCServer | 0.9.9-17.8.1 |
| SUSE Linux Enterprise Workstation Extension 15 | LibVNCServer | 0.9.10-4.3.1 |
| SUSE OpenStack Cloud 7 | LibVNCServer | 0.9.9-17.8.1 |
| Ubuntu 14.04 LTS | libvncserver | 0.9.9+dfsg-1ubuntu1.4 |
| Ubuntu 16.04 LTS | italc | 1:2.0.2+dfsg1-4ubuntu0.1 |
| Ubuntu 16.04 LTS | libvncserver | 0.9.10+dfsg-3ubuntu0.16.04.3 |
| Ubuntu 16.04 LTS | ssvnc | 1.0.29-2+deb8u1build0.16.04.1 |
| Ubuntu 16.04 LTS | tightvnc | no fix |
| Ubuntu 18.04 LTS | italc | 1:3.0.3+dfsg1-3ubuntu0.1 |
| Ubuntu 18.04 LTS | libvncserver | 0.9.11+dfsg-1ubuntu1.1 |
| Ubuntu 18.04 LTS | ssvnc | no fix |
| Ubuntu 18.04 LTS | tightvnc | no fix |
| Ubuntu 20.04 LTS | tightvnc | no fix |
| Ubuntu 22.04 LTS | tightvnc | no fix |
| Ubuntu 24.04 LTS | tightvnc | no fix |
| Ubuntu 25.10 | tightvnc | no fix |
| Ubuntu 26.04 LTS | tightvnc | no fix |
| Ubuntu 26.10 | tightvnc | no fix |
| Ubuntu Pro 14.04 LTS | tightvnc | 1.3.9-6.5+deb8u1build0.14.04.1~esm1 |
| openSUSE Leap 15.0 | LibVNCServer | 0.9.10-lp150.3.3.1 |