Buffer overflow in Gnu Libidn2

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.

Vulnerability class: Buffer Overflow

EPSS: 0.037 (88.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2019-18224?
CVE-2019-18224 is a critical-severity vulnerability in Gnu Libidn2, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-10-21.
How severe is CVE-2019-18224?
Critical severity. CVSS v3 base score is 9.8 out of 10.