CVE-2017-17484

Publication date 10 December 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
icu	17.10 artful	Not affected
	17.04 zesty	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

Red Hat says this was possibly introduced by: https://ssl.icu-project.org/trac/changeset/40455/trunk/icu4c/source/common/ucnv_u8.cpp

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
icu	Upstream: https://ssl.icu-project.org/trac/changeset/40714 Upstream: https://ssl.icu-project.org/trac/changeset/40715

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H