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Fencer Vulns
critical 9.8

CVE-2017-17484 json

The ucnv_UTF8FromUTF8 function in ucnv_u8.cpp in International Components for Unicode (ICU) for C/C++ through 60.1 mishandles ucnv_convertE…

published 2017-12-10 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-8646

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.5%
EPSS 4.5% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

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.

Patch / fix

  • icu SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +10 more 52.1-8.7.1
  • icu SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 4.0-47.6.1

suse advisories SUSE-SU-2018:1401-2SUSE-SU-2018:1602-1SUSE-SU-2018:1401-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-17484 updated cvss 7.3

icu: stack-based buffer overflow in ucnv_u8.cpp:ucnv_UTF8FromUTF8 can lead to denial of service

  • Red Hat Enterprise Linux 5 icu Red Hat Enterprise Linux 6 icu, libicu Red Hat Enterprise Linux 7 icu, libicu
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.48% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • ssl.icu-project.org https://ssl.icu-project.org/trac/attachment/ticket/13490/poc.cpp referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.