CVE-2018-20021

high

Description

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

References

Advisories
More

https://www.debian.org/security/2019/dsa-4383

https://usn.ubuntu.com/4587-1/

https://usn.ubuntu.com/4547-2/

https://usn.ubuntu.com/4547-1/

https://usn.ubuntu.com/3877-1/

https://security.gentoo.org/glsa/202006-06

https://security.gentoo.org/glsa/201908-05

https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html

https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-031-libvnc-infinite-loop/

https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html

https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html

https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html

https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-12599

Details

Source: Mitre, NVD

Published: 2018-12-19

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H