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CVE-2016-4423

7.5 · HIGH

The attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x be…

Published Jun 1, 2016CWE-399EPSS 1.86%

Overview

CVE-2016-4423 is a high-severity vulnerability. It was published on June 1, 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 attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x before 3.0.6 does not limit the length of a username stored in a session, which allows remote attackers to cause a denial of service (session storage consumption) via a series of authentication attempts with long, non-existent usernames.

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

Refwww.debian.org/security/2016/dsa-3588GitHubgithub.com/symfony/symfony/pull/18733Refsymfony.com/blog/cve-2016-4423-large-username-storage-in-sessionRefwww.debian.org/security/2016/dsa-3588GitHubgithub.com/symfony/symfony/pull/18733Refsymfony.com/blog/cve-2016-4423-large-username-storage-in-session

How CyberStrike helps

Frequently asked questions

What is CVE-2016-4423?

CVE-2016-4423 is a high-severity vulnerability. It was published on June 1, 2016 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2016-4423?

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-2016-4423?

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-2016-4423?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-4423 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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