CVE-2016-6263

libidn: Crash when given invalid UTF-8 data on input

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Severity

Low

Red Hat Product Security

3.7

CVSS 3.0

Review impact separately from score.

Published · January 14, 2016

Updated · November 21, 2025

Description

The stringprep_utf8_nfkc_normalize function in lib/nfkc.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via crafted UTF-8 data.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 3.7
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS 2.0 · 2.6
AV:N/AC:H/Au:N/C:N/I:N/A:P

CWE-20 · Improper Input Validation