CVE-2017-17484: Icu-Project International Components For Unicode

Critical severity, CVSS 9.8. EPSS: 4.5% chance of exploitation in the next 30 days.

The ucnv_UTF8FromUTF8 function in ucnv_u8.cpp in International Components for Unicode (ICU) for C/C++ through 60.1 mishandles ucnv_convertEx calls for UTF-8 to UTF-8 conversion, which allows remote attackers to cause a denial of service (stack-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted string, as demonstrated by ZNC.

Affected products

• Icu-Project International Components For Unicode: up to and including 60.1

Published 2017-12-10. Last modified 2026-06-17.