How many CVEs does LibVNC have?

LibVNC has 40 published CVE records since 2016, including 5 in the last two years.

How many LibVNC CVEs are in CISA KEV?

None of LibVNC's CVEs are currently listed in CISA's Known Exploited Vulnerabilities catalog.

Which LibVNC products have the most CVEs?

The LibVNC products with the most published CVEs are libvncserver, vncterm, x11vnc.

What are the most common weakness types in LibVNC CVEs?

LibVNC's CVEs most often map to these CWE weakness types: CWE-122 (Heap-based Buffer Overflow), CWE-125 (Out-of-bounds Read), CWE-369 (Divide By Zero), CWE-476 (NULL Pointer Dereference).

Are there public exploits for LibVNC vulnerabilities?

Yes — 3 of LibVNC's CVEs have a known public exploit.

How many critical LibVNC vulnerabilities are there?

LibVNC has 13 critical and 20 high-severity CVEs.

What is the average severity of LibVNC CVEs?

The average CVSS base score across LibVNC's scored CVEs is 8.1.

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40 CVEs

LibVNC Vulnerabilities

Name: LibVNC vulnerability dataset (CVEs)
Creator: RadicalNotion.AI
License: https://creativecommons.org/licenses/by-nc/4.0/

CVE security advisories and vulnerability history for LibVNC.

40

Total CVEs

Published

0

In CISA KEV

Exploited in the wild

3

Public exploits

PoC or exploit code

8.1

Avg CVSS

2016–2026

Overview

LibVNC has 40 published CVE records since 2016, of which 0 are in CISA's Known Exploited Vulnerabilities catalog and 3 have a known public exploit. The average CVSS base score across scored CVEs is 8.1.

This page aggregates every publicly disclosed vulnerability (CVE) affecting LibVNC products, with severity breakdowns, the most-affected products, the most common weakness types, and the latest disclosures.

Security scorecard

A quick read on LibVNC's vulnerability posture, as a share of its 40 published CVEs.

Average CVSS: 8.1
Critical / high: 83%
Actively exploited (KEV): 0%
Public exploit available: 8%
Patch available: 98%

Severity and exploitation

How the CVSS severity of LibVNC's CVEs breaks down, plus how many are exploited in the wild or have public exploit code.

Critical13

High20

Medium7

Low0

In CISA’s Known Exploited Vulnerabilities catalog

0

None of LibVNC's CVEs are currently listed in CISA's KEV catalog.

Public exploits

3

3 of LibVNC's CVEs have a known public exploit available.

Most affected products

The LibVNC products with the most published CVEs. Follow any product to browse its versions and vulnerabilities.

Common weakness types

The CWE weakness categories most often found in LibVNC CVEs. Follow any weakness for its full explanation.

CNAs that assign these CVEs

The CVE Numbering Authorities that publish LibVNC CVE records.

Disclosure activity by year

How many LibVNC CVEs were published each year.

2016

2

2018

11

2019

4

2020

17

2022

1

2025

1

2026

4

Latest LibVNC CVEs

The most recently disclosed vulnerabilities affecting LibVNC.

libvncclient Tight decoder has an attacker-controlled heap out-of-bounds write
CWE-122
High · CVSS 8.8
EPSS 0.3%2026-08-21
LibVNCClient Tight Gradient decoding allows malicious server-triggered heap/stack OOB writes
CWE-787
High · CVSS 8.8
EPSS 0.2%2026-05-27
LibVNCServer httpd proxy NULL Pointer Dereference
CWE-476
Medium · CVSS 6.3
EPSS 5.3%2026-03-24
LibVNCServer UltraZip Encoding Heap Out-of-bounds Read
CWE-125
Medium · CVSS 6.9
EPSS 0.4%2026-03-24
High vulnerability · 2025-01-24
CWE-122
High · CVSS 8.8
EPSS 0.7%2025-01-24
High vulnerability · 2022-09-02
High · CVSS 7.5
EPSS 1.1%2022-09-02
High vulnerability · 2020-11-27
CWE-369
High · CVSS 7.5
EPSS 1.6%2020-11-27
High vulnerability · 2020-11-25
High · CVSS 8.8
EPSS 1.8%2020-11-25
Critical vulnerability · 2020-06-30
Critical · CVSS 9.8
EPSS 2.3%2020-06-30
High vulnerability · 2020-06-17
High · CVSS 7.5
EPSS 2.6%2020-06-17
High vulnerability · 2020-06-17
High · CVSS 7.5
EPSS 3.4%2020-06-17
High vulnerability · 2020-06-17
High · CVSS 7.5
EPSS 2.8%2020-06-17

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Other vendors

Browse vulnerabilities for other tracked vendors.

microsoft36,673 CVEs linux22,774 CVEs Google16,481 CVEs Apple15,095 CVEs Oracle12,708 CVEs Debian10,226 CVEs IBM8,839 CVEs Red Hat8,111 CVEs

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Frequently asked questions

Common questions about LibVNC vulnerabilities.

How many CVEs does LibVNC have?: LibVNC has 40 published CVE records since 2016, including 5 in the last two years.
How many LibVNC CVEs are in CISA KEV?: None of LibVNC's CVEs are currently listed in CISA's Known Exploited Vulnerabilities catalog.
Which LibVNC products have the most CVEs?: The LibVNC products with the most published CVEs are libvncserver, vncterm, x11vnc.
What are the most common weakness types in LibVNC CVEs?: LibVNC's CVEs most often map to these CWE weakness types: CWE-122 (Heap-based Buffer Overflow), CWE-125 (Out-of-bounds Read), CWE-369 (Divide By Zero), CWE-476 (NULL Pointer Dereference).
Are there public exploits for LibVNC vulnerabilities?: Yes — 3 of LibVNC's CVEs have a known public exploit.
How many critical LibVNC vulnerabilities are there?: LibVNC has 13 critical and 20 high-severity CVEs.
What is the average severity of LibVNC CVEs?: The average CVSS base score across LibVNC's scored CVEs is 8.1.

References

Vulnerability data is sourced from the CVE Program; severity, KEV, and exploit signals are aggregated by RadicalNotion.AI.

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