CVE-2018-20023

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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 v3
7.5
EG Score
7.5(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
83%
KEV
Not listed

Published

December 19, 2018

Last Modified

November 21, 2024

References (16)

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibvncserver1 (0.9.10+dfsg-3ubuntu0.16.04.3) @ xenial2026-05-28ubuntu
ubuntulibitalccore (1:3.0.3+dfsg1-3ubuntu0.1) @ bionic2026-05-28ubuntu
ubuntulibitalccore (1:2.0.2+dfsg1-4ubuntu0.1) @ xenial2026-05-28ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-07-26 14:51 UTCEPSS rescore
  2. 2026-07-26 14:51 UTCEPSS rescore
  3. 2026-07-25 14:14 UTCEPSS rescore
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  7. 2026-07-23 01:35 UTCEG score recompute
  8. 2026-07-22 22:15 UTCEG score recompute
  9. 2026-07-22 14:05 UTCEPSS rescore
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  11. 2026-07-21 01:17 UTCOSV refresh
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  1. 2026-07-12 05:43 UTCEPSS rescore
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  13. 2026-07-03 20:26 UTCOSV refresh
  14. 2026-07-02 16:54 UTCEPSS rescore
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  45. 2026-06-15 17:45 UTCEPSS rescore
  46. 2026-06-15 08:43 UTCOSV refresh
  47. 2026-06-14 23:15 UTCEPSS rescore
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  49. 2026-06-13 22:58 UTCEPSS rescore
  50. 2026-06-12 23:09 UTCEPSS rescore
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  52. 2026-06-11 13:57 UTCEPSS rescore
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  73. 2026-05-29 13:41 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-20023?
CVE-2018-20023 is a high vulnerability published on December 19, 2018. 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…
When was CVE-2018-20023 disclosed?
CVE-2018-20023 was first published in the National Vulnerability Database on December 19, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-20023 actively exploited?
CVE-2018-20023 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 17.0% of all scored CVEs.
What is the CVSS score of CVE-2018-20023?
CVE-2018-20023 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2018-20023?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20023, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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