7.5

CVE-2018-20022: canonical ubuntu_linux Improper Initialization

CVSS: 7.5v3.0HighModified
AliasesUBUNTU-CVE-2018-20022DEBIAN-CVE-2018-20022
Published 19-12-2018Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-20022 is a high (CVSS 7.5) Improper Initialization vulnerability in canonical ubuntu_linux. EPSS estimates a 2.94% chance of exploitation in the next 30 days, higher than 86.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
2.94%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 16 · Related 9
DLA-1617-1DLA-1979-1DLA-2016-1DLA-2045-1DSA-4383-1MGASA-2019-0037

Timeline

  1. 19-12-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

LibVNC before 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 contains multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

2.94%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

0.00 pp

From 2.94% on 18-09-2026

18-09-202618-10-2026
EPSS score
2.94%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian5 products
  • libvncserver< 0.9.11+dfsg-1.2
  • ssvnc< 1.0.29-5
  • tightvnc< 1:1.3.9-9.1
  • veyon< 4.1.4+repack1-1
  • debian_linuxEOL8.0 | 9.0
Ubuntu4 products
  • italc< 1:2.0.2+dfsg1-4ubuntu0.1 | < 1:3.0.3+dfsg1-3ubuntu0.1
  • libvncserver< 0.9.9+dfsg-1ubuntu1.4 | < 0.9.10+dfsg-3ubuntu0.16.04.3 | < 0.9.11+dfsg-1ubuntu1.1
  • ssvnc< 1.0.29-2+deb8u1build0.16.04.1 | All versions (No fix recorded)
  • tightvnc< 1.3.9-6.5+deb8u1build0.14.04.1~esm1 | All versions (No fix recorded)
Canonical1 product
Libvnc_project1 product

4 vendors · 11 products

References

19 links
Show all 19 references