CVE-2020-25708

Publication date 13 November 2020

Last updated 11 July 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
x11vnc 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic Ignored end of life, was needs-triage
23.04 lunar Ignored end of life, was needs-triage
22.10 kinetic Ignored end of life, was needs-triage
22.04 LTS jammy
Not affected
21.10 impish Ignored end of life
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Needs evaluation
libvncserver 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Fixed 0.9.12+dfsg-9ubuntu0.3
18.04 LTS bionic
Fixed 0.9.11+dfsg-1ubuntu1.4
16.04 LTS xenial
Fixed 0.9.10+dfsg-3ubuntu0.16.04.6
14.04 LTS trusty Not in release
vino 25.10 questing
Fixed 3.22.0-6ubuntu3
25.04 plucky
Fixed 3.22.0-6ubuntu3
24.10 oracular
Fixed 3.22.0-6ubuntu3
24.04 LTS noble
Fixed 3.22.0-6ubuntu3
23.10 mantic
Fixed 3.22.0-6ubuntu3
23.04 lunar
Fixed 3.22.0-6ubuntu3
22.10 kinetic
Fixed 3.22.0-6ubuntu3
22.04 LTS jammy
Fixed 3.22.0-6ubuntu3
21.10 impish
Fixed 3.22.0-6ubuntu3
21.04 hirsute
Fixed 3.22.0-6ubuntu3
20.10 groovy
Fixed 3.22.0-6ubuntu2.1
20.04 LTS focal
Fixed 3.22.0-5ubuntu2.2
18.04 LTS bionic
Fixed 3.22.0-3ubuntu1.2
16.04 LTS xenial
Fixed 3.8.1-0ubuntu9.4
14.04 LTS trusty Not in release
italc 25.10 questing Not in release
25.04 plucky Not in release
24.10 oracular Not in release
24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty Not in release
tightvnc 25.10 questing
Needs evaluation
25.04 plucky
Needs evaluation
24.10 oracular Ignored end of life, was needs-triage
24.04 LTS noble
Needs evaluation
23.10 mantic Ignored end of life, was needs-triage
23.04 lunar Ignored end of life, was needs-triage
22.10 kinetic Ignored end of life, was needs-triage
22.04 LTS jammy
Needs evaluation
21.10 impish Ignored end of life
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation
veyon 25.10 questing
Needs evaluation
25.04 plucky
Needs evaluation
24.10 oracular Ignored end of life, was needs-triage
24.04 LTS noble
Needs evaluation
23.10 mantic Ignored end of life, was needs-triage
23.04 lunar Ignored end of life, was needs-triage
22.10 kinetic Ignored end of life, was needs-triage
22.04 LTS jammy
Needs evaluation
21.10 impish Ignored end of life
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal
Needs evaluation
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release

Notes

leosilva

vino ships libvncserver source in server/libvncserver

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libvncserver

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-4636-1
    • LibVNCServer, Vino vulnerability
    • 17 November 2020

Other references