CVE-2017-17484
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.48%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.48% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- icu-project/international components for unicode
- Source
- cve@mitre.org
EPSS 4.5% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/znc/znc/issues/1459Issue Tracking, Third Party Advisory
- https://ssl.icu-project.org/trac/attachment/ticket/13490/poc.cppExploit, Vendor Advisory
- https://ssl.icu-project.org/trac/changeset/40714Issue Tracking, Patch, Vendor Advisory
- https://ssl.icu-project.org/trac/changeset/40715Issue Tracking, Vendor Advisory
- https://ssl.icu-project.org/trac/ticket/13490Issue Tracking, Vendor Advisory
- https://ssl.icu-project.org/trac/ticket/13510Issue Tracking, Vendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://github.com/znc/znc/issues/1459Issue Tracking, Third Party Advisory
- https://ssl.icu-project.org/trac/attachment/ticket/13490/poc.cppExploit, Vendor Advisory
- https://ssl.icu-project.org/trac/changeset/40714Issue Tracking, Patch, Vendor Advisory
- https://ssl.icu-project.org/trac/changeset/40715Issue Tracking, Vendor Advisory
- https://ssl.icu-project.org/trac/ticket/13490Issue Tracking, Vendor Advisory
- https://ssl.icu-project.org/trac/ticket/13510Issue Tracking, Vendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.