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Vulnerability record · CVE-2020-25708 · published 27 November 2020

CVE-2020-25708: Libvncserver project libvncserver divide by zero vulnerability

LLibvncserver Project · Libvncserver

A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw to send a specially crafted message that, when processed by the VNC server, would lead to a floating point exception, resulting in a denial of service.

7.5 CVSS 3.1 High EPSS 1.6% · top 24.7% CWE-369 · Divide by zero
7.5CVSS 3.1 base score, v2 5.0
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw to send a specially crafted message that, when processed by the VNC server, would lead to a floating point exception, resulting in a denial of service.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1896739 ExploitIssue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00035.html Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1896739 ExploitIssue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00035.html Mailing ListThird Party Advisory

Track CVE-2020-25708 inside VULONE

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-25708), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.