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CVE-2019-18224
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.
Critical9.8EPSS 3.7%
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
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.
Timeline
ID reserved
By mitre
Published
- 7 years later
· 7 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 3.7% · top 10% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
n/a
- affected n/a
References (12)
- https://github.com/libidn/libidn2/compare/libidn2-2.1.0...libidn2-2.1.1 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/libidn/libidn2/commit/e4d1558aa2c1c04a05066ee8600f37603890ba8c (opens in a new tab)x_refsource_MISCx_transferred
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12420 (opens in a new tab)x_refsource_MISCx_transferred
- USN-4168-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- FEDORA-2019-a8d35fcf7c (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2019-d3221d69e0 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- openSUSE-SU-2019:2611 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2019:2613 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- DSA-4613 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 20200203 [SECURITY] [DSA 4613-1] libidn2 security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- GLSA-202003-63 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2019-18224)Record last updated .