7.5

CVE-2018-20023: canonical ubuntu_linux Improper Initialization

CVSS: 7.5v3.0HighModified
AliasesUBUNTU-CVE-2018-20023DEBIAN-CVE-2018-20023
Published 19-12-2018Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-20023 is a high (CVSS 7.5) Improper Initialization vulnerability in canonical ubuntu_linux. EPSS estimates a 2.50% chance of exploitation in the next 30 days, higher than 84.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
2.50%
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 12 · Related 7
DLA-1617-1DLA-1979-1DSA-4383-1MGASA-2019-0037MGASA-2020-0435OPENSUSE-SU-2019:0053-1

Timeline

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

Description

LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater 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

2.50%

Chance of exploitation in the next 30 days

Percentile

84%

Versus all other CVEs

30-day change

0.00 pp

From 2.50% on 18-09-2026

18-09-202618-10-2026
EPSS score
2.50%

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

Debian3 products
  • libvncserver< 0.9.11+dfsg-1.2
  • veyon< 4.1.4+repack1-1
  • debian_linuxEOL8.0 | 9.0
Ubuntu2 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
Canonical1 product
Libvnc_project1 product

4 vendors · 7 products

References

14 links
Show all 14 references