CVE-2018-20750

critical

Description

LibVNC through 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.

References

Advisories
More

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

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

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

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

https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html

https://github.com/LibVNC/libvncserver/issues/273

https://github.com/LibVNC/libvncserver/commit/09e8fc02f59f16e2583b34fe1a270c238bd9ffec

https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf

https://www.openwall.com/lists/oss-security/2018/12/10/8

https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-13293

http://www.securityfocus.com/bid/106825

Details

Source: Mitre, NVD

Published: 2019-01-30

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 7.5

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

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.10905