THREATPORT/VULNERABILITY/CVE-2018-20021
HIGH SEVERITY

CVE-2018-20021

Libvncserver vulnerability

CVSS
7.5
EPSS
3.5%
EPSS pct
88th
Exploited
No known
LibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM
Affected vendor
Libvnc Project
Affected product
Libvncserver
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)
Published
2018-12-19

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 3.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2018-20021

  • Confirm whether Libvnc Project Libvncserver is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2018-20021.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-20021

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2018-20021 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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