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CVE-2016-6261

7.5 · HIGH

The idna_to_ascii_4i function in lib/idna.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via 64 bytes of input.

Published Sep 7, 2016CWE-125EPSS 3.88%

Overview

CVE-2016-6261 is a high-severity vulnerability. It was published on September 7, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The idna_to_ascii_4i function in lib/idna.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via 64 bytes of input.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.savannah.gnu.org/cgit/libidn.git/commit/?id=f20ce1128fb7f4d33297eee307dddaf0f92ac72dReflists.opensuse.org/opensuse-updates/2016-08/msg00098.htmlRefwww.debian.org/security/2016/dsa-3658Refwww.openwall.com/lists/oss-security/2016/07/20/6Refwww.openwall.com/lists/oss-security/2016/07/21/4Refwww.securityfocus.com/bid/92070Refwww.ubuntu.com/usn/USN-3068-1Reflists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3EReflists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3EReflists.gnu.org/archive/html/help-libidn/2015-07/msg00016.html

How CyberStrike helps

Frequently asked questions

What is CVE-2016-6261?

CVE-2016-6261 is a high-severity vulnerability. It was published on September 7, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2016-6261?

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-6261?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-6261?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-6261 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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