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Vulnerabilities / CVE-2018-20020

critical

CVE-2018-20020

libvncserver: Heap out-of-bound write inside structure in VNC client code allows for potential code execution

Published Modified CWE 787
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat8.8CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (medium), Ubuntu (medium).

Description

LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution

Affected packages and fixed versions

SourcePackageFixed in
debian 10ssvnc1.0.29-4+deb10u1
debian 11libvncserver, ssvnc, veyon0.9.11+dfsg-1.2 and 2 more
debian 12libvncserver, ssvnc, veyon0.9.11+dfsg-1.2 and 2 more
debian 13libvncserver, ssvnc, veyon0.9.11+dfsg-1.2 and 2 more
debian 14libvncserver, ssvnc0.9.11+dfsg-1.2 and 1 more
debian 8italc, libvncserver, ssvnc1:2.0.2+dfsg1-2+deb8u1 and 2 more
debian 9libvncserver, ssvnc0.9.11+dfsg-1.3~deb9u1 and 1 more
echolibvncserver, ssvnc, veyon0.9.11+dfsg-1.2 and 2 more
Red Hatlibvncserver, libvncserver-develno fix listed
ubuntu 14.04libvncserver0.9.9+dfsg-1ubuntu1.4
ubuntu 14.04-ESMtightvnc1.3.9-6.5+deb8u1build0.14.04.1~esm1
ubuntu 16.04italc, libvncserver, ssvnc1:2.0.2+dfsg1-4ubuntu0.1 and 2 more
Show all 36 entries from 16 sources
SourcePackageFixed in
debian 10ssvnc1.0.29-4+deb10u1
debian 11libvncserver0.9.11+dfsg-1.2
debian 11ssvnc1.0.29-5
debian 11veyon4.1.4+repack1-1
debian 12libvncserver0.9.11+dfsg-1.2
debian 12ssvnc1.0.29-5
debian 12veyon4.1.4+repack1-1
debian 13libvncserver0.9.11+dfsg-1.2
debian 13ssvnc1.0.29-5
debian 13veyon4.1.4+repack1-1
debian 14libvncserver0.9.11+dfsg-1.2
debian 14ssvnc1.0.29-5
debian 8italc1:2.0.2+dfsg1-2+deb8u1
debian 8libvncserver0.9.9+dfsg2-6.1+deb8u4
debian 8ssvnc1.0.29-2+deb8u1
debian 9libvncserver0.9.11+dfsg-1.3~deb9u1
debian 9ssvnc1.0.29-3+deb9u1
echolibvncserver0.9.11+dfsg-1.2
echossvnc1.0.29-5
echoveyon4.1.4+repack1-1
Red Hatlibvncserverno fix listed
Red Hatlibvncserver-develno fix listed
ubuntu 14.04libvncserver0.9.9+dfsg-1ubuntu1.4
ubuntu 14.04-ESMtightvnc1.3.9-6.5+deb8u1build0.14.04.1~esm1
ubuntu 16.04italc1:2.0.2+dfsg1-4ubuntu0.1
ubuntu 16.04libvncserver0.9.10+dfsg-3ubuntu0.16.04.3
ubuntu 16.04ssvnc1.0.29-2+deb8u1build0.16.04.1
ubuntu 16.04-ESMitalc1:2.0.2+dfsg1-4ubuntu0.1
ubuntu 16.04-ESMlibvncserver0.9.10+dfsg-3ubuntu0.16.04.3
ubuntu 16.04-ESMssvnc1.0.29-2+deb8u1build0.16.04.1
ubuntu 18.04italc1:3.0.3+dfsg1-3ubuntu0.1
ubuntu 18.04libvncserver0.9.11+dfsg-1ubuntu1.1
ubuntu 18.04-ESMitalc1:3.0.3+dfsg1-3ubuntu0.1
ubuntu 18.04-ESMlibvncserver0.9.11+dfsg-1ubuntu1.1
ubuntu 18.04-ESMssvncno fix listed
ubuntu 18.10libvncserver0.9.11+dfsg-1.1ubuntu0.1

References

All 18 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.