CVE-2017-17484

9.8 criticalEPSS 4.5%

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.

Severity

CVSS 3.0

9.8 critical

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 4.5% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-31)
CWE: CWE-119
Published: 2017-12-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

icu-project:international_components_for_unicode

References

https://github.com/znc/znc/issues/1459
https://ssl.icu-project.org/trac/attachment/ticket/13490/poc.cpp
https://ssl.icu-project.org/trac/changeset/40714
https://ssl.icu-project.org/trac/changeset/40715
https://ssl.icu-project.org/trac/ticket/13490

Check your stack JSON