CVE-2019-18224

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) 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: 4%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

idn2_to_ascii_4i in lib/lookup.c in GNU libidn2 before 2.1.1 has a heap-based buffer overflow via a long domain string.

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%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
88.6%
KEV
Not listed

Published

October 21, 2019

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Jun 22, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

GNU IDN Library 2: Multiple vulnerabilities (GLSA 202003-63) — Gentoo security

https://security.gentoo.org/glsa/202003-63
generic

Bugtraq: [SECURITY] [DSA 4613-1] libidn2 security update

https://seclists.org/bugtraq/2020/Feb/4
generic

[SECURITY] Fedora 30 Update: mingw-libidn2-2.2.0-1.fc30 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MINU5RKDFE6TKAFY5DRFN3WSFDS4DYVS/
generic

[SECURITY] Fedora 29 Update: mingw-libidn2-2.2.0-1.fc29 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JDQVQ2XPV5BTZUFINT7AFJSKNNBVURNJ/
generic

Comparing libidn2-2.1.0...libidn2-2.1.1 · libidn/libidn2 · GitHub

https://github.com/libidn/libidn2/compare/libidn2-2.1.0...libidn2-2.1.1
github_commit

commit e4d1558aa2c1 (libidn/libidn2)

Fix landed in libidn/libidn2 commit e4d1558aa2c1 — awaiting tagged release

https://github.com/libidn/libidn2/commit/e4d1558aa2c1c04a05066ee8600f37603890ba8c
generic
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12420

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibidn2-doc (2.0.5-1ubuntu0.3) @ disco2026-05-27ubuntu
redhatlibidn2-0:2.2.0-1.el82019-11-05redhat

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

(2)

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 15× 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. 2026-07-24 14:14 UTCEPSS rescore
  2. 2026-07-24 14:14 UTCEPSS rescore
  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:42 UTCEG score recompute
  5. 2026-07-22 22:22 UTCEG score recompute
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  11. 2026-07-20 03:16 UTCOSV refresh
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  1. 2026-07-09 19:06 UTCEPSS rescore
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  3. 2026-07-07 13:43 UTCEPSS rescore
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  8. 2026-07-04 06:28 UTCEPSS rescore
  9. 2026-07-02 18:05 UTCOSV refresh
  10. 2026-07-01 15:03 UTCEPSS rescore
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  24. 2026-06-21 14:54 UTCEPSS rescore
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  30. 2026-06-18 17:50 UTCEPSS rescore
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  36. 2026-06-14 16:13 UTCOSV refresh
  37. 2026-06-13 22:58 UTCEPSS rescore
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  40. 2026-06-10 22:16 UTCEPSS rescore
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  45. 2026-06-06 13:45 UTCEPSS rescore
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  63. 2026-05-27 13:38 UTCEPSS rescore
  64. 2026-05-27 12:42 UTCEG score recompute
  65. 2026-05-27 12:42 UTCVendor advisory
  66. 2026-05-27 12:42 UTCGHSA enrichment
  67. 2026-05-26 13:42 UTCEPSS rescore
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  72. 2026-05-25 03:19 UTCOSV refresh

Frequently asked(5)

What is CVE-2019-18224?
CVE-2019-18224 is a critical vulnerability published on October 21, 2019. idn2toascii_4i in lib/lookup.c in GNU libidn2 before 2.1.1 has a heap-based buffer overflow via a long domain string.
When was CVE-2019-18224 disclosed?
CVE-2019-18224 was first published in the National Vulnerability Database on October 21, 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-2019-18224 actively exploited?
CVE-2019-18224 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-18224?
CVE-2019-18224 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-18224?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18224, 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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