CVE-2019-20788

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
84%
KEV
Not listed

Published

April 23, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Sep 13, 2026
Patch available. Sources: github_commit, github.
github Patch Available

GHSL-2020-064: integer overflow in LibVNCClient HandleCursorShape resulting in remote heap overflow - CVE-2019-20788 | GitHub Security Lab

https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclient
github_commit Patch Available

commit 54220248886b (LibVNC/libvncserver)

Patch available: LibVNC/libvncserver LibVNCServer-0.9.13 (contains commit 54220248886b)

https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fed
generic
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf

Vendor Advisories for CVE-2019-20788(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibvncserver1 (0.9.10+dfsg-3ubuntu0.16.04.4) @ xenial2026-05-27ubuntu
redhatlibvncserver-0:0.9.9-14.el7_72020-03-23redhat
redhatlibvncserver-0:0.9.11-9.el8_1.22020-03-23redhat
redhatlibvncserver-0:0.9.11-9.el8_0.22020-03-23redhat

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.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libvncserver—0.9.12+dfsg-9—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libvncserver—0.9.12+dfsg-9—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libvncserver—0.9.12+dfsg-9—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libvncserver—0.9.12+dfsg-9—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
libvncserver0.9.9+dfsg-6.1 ... 0.9.9+dfsg2-6.1+deb8u6 (7 versions)0.9.9+dfsg2-6.1+deb8u7—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 25× 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 143 total refreshes for this CVE.

  1. 2026-09-18 19:22 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 14:04 UTCEPSS rescore
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  9. 2026-09-07 15:57 UTCEPSS rescore
  10. 2026-09-07 14:17 UTCOSV refresh
  11. 2026-09-06 13:44 UTCEPSS rescore
  12. 2026-09-05 15:24 UTCEPSS rescore
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  24. 2026-08-20 23:15 UTCOSV refresh
  25. 2026-08-20 22:51 UTCEPSS rescore
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  1. 2026-08-19 17:00 UTCEPSS rescore
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  5. 2026-08-16 02:10 UTCEPSS rescore
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  9. 2026-08-08 16:33 UTCEPSS rescore
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  11. 2026-08-06 13:43 UTCEPSS rescore
  12. 2026-08-05 19:13 UTCEPSS rescore
  13. 2026-08-05 14:41 UTCOSV refresh
  14. 2026-08-04 15:05 UTCEPSS rescore
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  23. 2026-07-24 14:14 UTCEPSS rescore
  24. 2026-07-23 14:15 UTCEPSS rescore
  25. 2026-07-23 01:44 UTCEG score recompute
  26. 2026-07-22 22:24 UTCEG score recompute
  27. 2026-07-22 14:05 UTCEPSS rescore
  28. 2026-07-21 15:22 UTCEPSS rescore
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  30. 2026-07-20 17:04 UTCEPSS rescore
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  32. 2026-07-19 14:28 UTCEPSS rescore
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  34. 2026-07-19 13:54 UTCOSV refresh
  35. 2026-07-19 02:26 UTCEPSS rescore
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  37. 2026-07-18 10:01 UTCEPSS rescore
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  40. 2026-07-15 16:55 UTCEPSS rescore
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  42. 2026-07-13 22:27 UTCEPSS rescore
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  47. 2026-07-11 08:24 UTCEPSS rescore
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  49. 2026-07-09 19:06 UTCEPSS rescore
  50. 2026-07-08 15:11 UTCEPSS rescore
  51. 2026-07-07 13:43 UTCEPSS rescore
  52. 2026-07-06 16:25 UTCEPSS rescore
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  57. 2026-07-01 23:31 UTCOSV refresh
  58. 2026-07-01 15:03 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2019-20788?
CVE-2019-20788 is a critical vulnerability published on April 23, 2020. libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.
When was CVE-2019-20788 disclosed?
CVE-2019-20788 was first published in the National Vulnerability Database on April 23, 2020, 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-2019-20788 actively exploited?
CVE-2019-20788 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 16.0% of all scored CVEs.
What is the CVSS score of CVE-2019-20788?
CVE-2019-20788 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-20788?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-20788, 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.

Dependency Blast Radius

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