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
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 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
—
EPSS
82.6%
KEV
Not listed

Published

April 23, 2020

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 27, 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

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.

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 14× in last 7d / 46× 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.

  1. 2026-07-22 22:24 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  7. 2026-07-19 14:28 UTCEPSS rescore
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  9. 2026-07-19 13:54 UTCOSV refresh
  10. 2026-07-19 02:26 UTCEPSS rescore
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  1. 2026-07-07 13:43 UTCEPSS rescore
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  4. 2026-07-06 02:20 UTCEPSS rescore
  5. 2026-07-05 02:27 UTCEPSS rescore
  6. 2026-07-04 06:28 UTCEPSS rescore
  7. 2026-07-01 23:31 UTCOSV refresh
  8. 2026-07-01 15:03 UTCEPSS rescore
  9. 2026-07-01 15:03 UTCEPSS rescore
  10. 2026-06-30 23:20 UTCEPSS rescore
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  18. 2026-06-24 14:03 UTCEPSS rescore
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  20. 2026-06-23 21:31 UTCEPSS rescore
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  22. 2026-06-21 14:54 UTCEPSS rescore
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  24. 2026-06-21 01:57 UTCEPSS rescore
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  26. 2026-06-19 19:23 UTCEPSS rescore
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  28. 2026-06-18 17:50 UTCEPSS rescore
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  31. 2026-06-15 17:45 UTCEPSS rescore
  32. 2026-06-14 23:15 UTCEPSS rescore
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  34. 2026-06-14 03:43 UTCOSV refresh
  35. 2026-06-13 22:58 UTCEPSS rescore
  36. 2026-06-12 23:09 UTCEPSS rescore
  37. 2026-06-11 13:58 UTCEPSS rescore
  38. 2026-06-10 22:16 UTCEPSS rescore
  39. 2026-06-10 13:19 UTCEPSS rescore
  40. 2026-06-08 14:15 UTCEPSS rescore
  41. 2026-06-07 15:23 UTCEPSS rescore
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  43. 2026-06-06 13:45 UTCEPSS rescore
  44. 2026-06-06 13:45 UTCEPSS rescore
  45. 2026-06-05 22:45 UTCEPSS rescore
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  47. 2026-06-05 06:08 UTCEPSS rescore
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  49. 2026-06-04 13:10 UTCEPSS rescore
  50. 2026-06-04 13:10 UTCEPSS rescore
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  53. 2026-05-31 22:29 UTCEPSS rescore
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  55. 2026-05-31 00:14 UTCEPSS rescore
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  57. 2026-05-29 13:42 UTCEPSS rescore
  58. 2026-05-28 13:43 UTCEPSS rescore
  59. 2026-05-27 13:38 UTCEPSS rescore
  60. 2026-05-27 04:20 UTCEG score recompute
  61. 2026-05-27 04:20 UTCVendor advisory
  62. 2026-05-27 04:20 UTCGHSA enrichment
  63. 2026-05-26 13:42 UTCEPSS rescore
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  65. 2026-05-26 07:17 UTCEPSS rescore
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  67. 2026-05-26 07:17 UTCEPSS rescore
  68. 2026-05-26 03:16 UTCOSV refresh

Related CVEs(same vendor + same CWE)

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 82.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

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