CVE-2019-8271

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 8%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

UltraVNC revision 1211 has a heap buffer overflow vulnerability in VNC server code inside file transfer handler, which can potentially result code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1212.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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%
Exploitation8% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
94.3%
KEV
Not listed

Published

March 8, 2019

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jun 8, 2026
No patch confirmed yet.
generic

Siemens SINUMERIK | CISA

https://www.us-cert.gov/ics/advisories/icsa-20-161-06
generic

KLCERT-19-018: UltraVNC Heap-based Buffer Overflow | Kaspersky ICS CERT EN

https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-018-ultravnc-heap-based-buffer-overflow/

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 44× 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. 2026-07-23 01:47 UTCEG score recompute
  2. 2026-07-22 22:29 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
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  6. 2026-07-20 17:04 UTCEPSS rescore
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  1. 2026-07-06 16:25 UTCEPSS rescore
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  11. 2026-06-28 04:54 UTCEPSS rescore
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  18. 2026-06-23 21:31 UTCEPSS rescore
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  20. 2026-06-22 14:23 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. 2026-06-18 17:50 UTCEPSS rescore
  27. 2026-06-18 17:50 UTCEPSS rescore
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  30. 2026-06-15 17:46 UTCEPSS rescore
  31. 2026-06-14 23:15 UTCEPSS rescore
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  36. 2026-06-11 13:58 UTCEPSS rescore
  37. 2026-06-10 22:16 UTCEPSS rescore
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  39. 2026-06-10 13:19 UTCEPSS rescore
  40. 2026-06-08 14:15 UTCEPSS rescore
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  43. 2026-06-07 15:23 UTCEPSS rescore
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  45. 2026-06-06 13:45 UTCEPSS rescore
  46. 2026-06-06 13:45 UTCEPSS rescore
  47. 2026-06-05 22:45 UTCEPSS rescore
  48. 2026-06-05 06:08 UTCEPSS rescore
  49. 2026-06-04 13:10 UTCEPSS rescore
  50. 2026-06-04 13:10 UTCEPSS rescore
  51. 2026-06-02 20:11 UTCEPSS rescore
  52. 2026-06-02 20:11 UTCEPSS rescore
  53. 2026-06-01 13:50 UTCEPSS rescore
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  55. 2026-05-31 22:29 UTCEPSS rescore
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  57. 2026-05-31 00:14 UTCEPSS rescore
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  59. 2026-05-29 13:42 UTCEPSS rescore
  60. 2026-05-28 13:43 UTCEPSS rescore
  61. 2026-05-28 13:43 UTCEPSS rescore
  62. 2026-05-27 21:56 UTCEG score recompute
  63. 2026-05-27 21:56 UTCGHSA enrichment
  64. 2026-05-27 13:39 UTCEPSS rescore
  65. 2026-05-27 13:38 UTCEPSS rescore
  66. 2026-05-26 07:17 UTCEPSS rescore
  67. 2026-05-26 07:17 UTCEPSS rescore
  68. 2026-05-26 07:17 UTCEPSS rescore
  69. 2026-05-24 16:47 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2019-8271?
CVE-2019-8271 is a critical vulnerability published on March 8, 2019. UltraVNC revision 1211 has a heap buffer overflow vulnerability in VNC server code inside file transfer handler, which can potentially result code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1212.
When was CVE-2019-8271 disclosed?
CVE-2019-8271 was first published in the National Vulnerability Database on March 8, 2019, 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-2019-8271 actively exploited?
CVE-2019-8271 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-8271?
CVE-2019-8271 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-8271?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-8271, 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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