GNU LIBIDN2 vulnerabilities

4 CVEs affecting GNU LIBIDN2, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2019-12290, published 2019-10-22.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2017-14062, published 2017-08-31. Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days. Integer overflow in the decode_digit function in puny_decode.c in Libidn2 before 2.0.4 allows remote attackers to cause a denial of service or possibly have unspecified other impact.
• CVE-2019-18224, published 2019-10-21. Critical severity, CVSS 9.8. EPSS: 3.7% chance of exploitation in the next 30 days. 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.
• CVE-2019-12290, published 2019-10-22. High severity, CVSS 7.5. EPSS: 3.2% chance of exploitation in the next 30 days. GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to…
• CVE-2017-14061, published 2017-08-31. Critical severity, CVSS 9.8. EPSS: 2.4% chance of exploitation in the next 30 days. Integer overflow in the _isBidi function in bidi.c in Libidn2 before 2.0.4 allows remote attackers to cause a denial of service or possibly have unspecified other impact.