CVE-2019-6991

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
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

A classic Stack-based buffer overflow exists in the zmLoadUser() function in zm_user.cpp of the zmu binary in ZoneMinder through 1.32.3, allowing an unauthenticated attacker to execute code via a long username.

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%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
87%
KEV
Not listed

Published

January 28, 2019

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 28, 2026
Patch available. Sources: github_pr.
github_pr Patch Available

Fixes 2478 Remove overrun possibility

Patch available: ZoneMinder/zoneminder 1.36.12 (PR #2482 merged 2019-01-25)

https://github.com/ZoneMinder/zoneminder/pull/2482
generic

Stack based buffer Overflow - /src/zm_user.cpp (zmu) · Issue #2478 · ZoneMinder/zoneminder · GitHub

https://github.com/ZoneMinder/zoneminder/issues/2478

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuzoneminder (1.29.0+dfsg-1ubuntu2+esm1) @ xenial2026-05-27ubuntu

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

(1)

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 10× in last 7d / 42× 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 104 total refreshes for this CVE.

  1. 2026-07-25 14:14 UTCEPSS rescore
  2. 2026-07-24 14:14 UTCEPSS rescore
  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:46 UTCEG score recompute
  5. 2026-07-22 22:28 UTCEG score recompute
  6. 2026-07-22 14:05 UTCEPSS rescore
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  9. 2026-07-20 23:02 UTCOSV refresh
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  24. 2026-07-11 08:24 UTCEPSS rescore
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  1. 2026-07-09 19:06 UTCEPSS rescore
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  3. 2026-07-07 13:43 UTCEPSS rescore
  4. 2026-07-06 16:25 UTCEPSS rescore
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  6. 2026-07-06 02:20 UTCEPSS rescore
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  8. 2026-07-05 02:27 UTCEPSS rescore
  9. 2026-07-04 06:28 UTCEPSS rescore
  10. 2026-07-03 18:26 UTCOSV refresh
  11. 2026-07-01 15:03 UTCEPSS rescore
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  13. 2026-06-30 23:20 UTCEPSS rescore
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  18. 2026-06-27 03:06 UTCEPSS rescore
  19. 2026-06-25 13:47 UTCEPSS rescore
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  21. 2026-06-24 14:03 UTCEPSS rescore
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  23. 2026-06-23 21:31 UTCEPSS rescore
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  25. 2026-06-22 14:23 UTCEPSS rescore
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  27. 2026-06-21 14:54 UTCEPSS rescore
  28. 2026-06-21 14:54 UTCEPSS rescore
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  31. 2026-06-19 19:23 UTCEPSS rescore
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  37. 2026-06-15 17:46 UTCEPSS rescore
  38. 2026-06-15 06:43 UTCOSV refresh
  39. 2026-06-14 23:15 UTCEPSS rescore
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  41. 2026-06-13 22:58 UTCEPSS rescore
  42. 2026-06-12 23:09 UTCEPSS rescore
  43. 2026-06-12 23:09 UTCEPSS rescore
  44. 2026-06-11 13:58 UTCEPSS rescore
  45. 2026-06-10 22:16 UTCEPSS rescore
  46. 2026-06-10 22:16 UTCEPSS rescore
  47. 2026-06-10 13:19 UTCEPSS rescore
  48. 2026-06-08 14:15 UTCEPSS rescore
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  50. 2026-06-08 14:15 UTCEPSS rescore
  51. 2026-06-07 15:23 UTCEPSS rescore
  52. 2026-06-07 15:23 UTCEPSS rescore
  53. 2026-06-06 13:45 UTCEPSS rescore
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  55. 2026-06-05 22:45 UTCEPSS rescore
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  58. 2026-06-02 20:11 UTCEPSS rescore
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  60. 2026-06-01 13:50 UTCEPSS rescore
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  68. 2026-05-28 13:43 UTCEPSS rescore
  69. 2026-05-27 22:55 UTCEG score recompute
  70. 2026-05-27 22:55 UTCVendor advisory
  71. 2026-05-27 22:55 UTCGHSA enrichment
  72. 2026-05-27 13:39 UTCEPSS rescore
  73. 2026-05-27 13:38 UTCEPSS rescore
  74. 2026-05-26 13:42 UTCEPSS rescore
  75. 2026-05-26 07:17 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2019-6991?
CVE-2019-6991 is a critical vulnerability published on January 28, 2019. A classic Stack-based buffer overflow exists in the zmLoadUser() function in zm_user.cpp of the zmu binary in ZoneMinder through 1.32.3, allowing an unauthenticated attacker to execute code via a long username.
When was CVE-2019-6991 disclosed?
CVE-2019-6991 was first published in the National Vulnerability Database on January 28, 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-2019-6991 actively exploited?
CVE-2019-6991 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 12.7% of all scored CVEs.
What is the CVSS score of CVE-2019-6991?
CVE-2019-6991 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-6991?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-6991, 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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