CVE-2016-6263

Name: CVE-2016-6263
Creator: NVD / NIST
Published: 2016-09-07T20:59:06.873+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.91%

Last modified Jun 17, 2026

CVE-2016-6263 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 3.91% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

3.91%

88.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Gnu	Libidn	<= 1.32

References

http://git.savannah.gnu.org/cgit/libidn.git/commit/?id=1fbee57ef3c72db2206dd87e4162108b2f425555Issue Tracking, Patch
http://lists.opensuse.org/opensuse-updates/2016-08/msg00005.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-08/msg00098.htmlThird Party Advisory
http://www.debian.org/security/2016/dsa-3658
http://www.openwall.com/lists/oss-security/2016/07/20/6Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/07/21/4Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/92070Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/USN-3068-1Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://lists.gnu.org/archive/html/help-libidn/2016-07/msg00009.htmlVendor Advisory
https://security.gentoo.org/glsa/201908-06
http://git.savannah.gnu.org/cgit/libidn.git/commit/?id=1fbee57ef3c72db2206dd87e4162108b2f425555Issue Tracking, Patch
http://lists.opensuse.org/opensuse-updates/2016-08/msg00005.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-08/msg00098.htmlThird Party Advisory
http://www.debian.org/security/2016/dsa-3658
http://www.openwall.com/lists/oss-security/2016/07/20/6Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/07/21/4Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/92070Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/USN-3068-1Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://lists.gnu.org/archive/html/help-libidn/2016-07/msg00009.htmlVendor Advisory
https://security.gentoo.org/glsa/201908-06

Timeline

Published: Sep 7, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-6263?

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.

How severe is CVE-2016-6263?

Severity scoring for CVE-2016-6263 is pending analysis. The EPSS model estimates a 3.91% probability of exploitation in the next 30 days.

How do I fix CVE-2016-6263?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-6263?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST