What’s Vulnerable › Vulnerabilities

CVE-2017-17484

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-12-10 · updated 2026-06-17
• Weakness: CWE-119

Description

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: through 60.1

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
• https://ssl.icu-project.org/trac/ticket/13510
• https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
• 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

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