High severity7.5NVD Advisory· Published Jun 1, 2016· Updated May 6, 2026
CVE-2016-4423
CVE-2016-4423
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/security-httpPackagist | >= 2.3.0, < 2.3.41 | 2.3.41 |
symfony/security-httpPackagist | >= 2.4.0, < 2.7.13 | 2.7.13 |
symfony/security-httpPackagist | >= 2.8.0, < 2.8.6 | 2.8.6 |
symfony/security-httpPackagist | >= 3.0.0, < 3.0.6 | 3.0.6 |
symfony/securityPackagist | >= 2.3.0, < 2.3.41 | 2.3.41 |
symfony/securityPackagist | >= 2.4.0, < 2.7.13 | 2.7.13 |
symfony/securityPackagist | >= 2.8.0, < 2.8.6 | 2.8.6 |
symfony/securityPackagist | >= 3.0.0, < 3.0.6 | 3.0.6 |
symfony/symfonyPackagist | >= 2.3.0, < 2.3.41 | 2.3.41 |
symfony/symfonyPackagist | >= 2.4.0, < 2.7.13 | 2.7.13 |
symfony/symfonyPackagist | >= 2.8.0, < 2.8.6 | 2.8.6 |
symfony/symfonyPackagist | >= 3.0.0, < 3.0.6 | 3.0.6 |
Affected products
27cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*+ 25 more
- cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*range: <=2.3.40
- cpe:2.3:a:sensiolabs:symfony:2.7.0:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.1:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.10:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.11:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.12:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.2:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.3:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.4:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.5:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.6:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.7:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.8:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.7.9:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.0:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.1:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.2:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.3:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.4:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:2.8.5:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.4:*:*:*:*:*:*:*
- cpe:2.3:a:sensiolabs:symfony:3.0.5:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
9- github.com/advisories/GHSA-whgv-8cg3-7hcmghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2016-4423ghsaADVISORY
- symfony.com/blog/cve-2016-4423-large-username-storage-in-sessionnvdVendor AdvisoryWEB
- www.debian.org/security/2016/dsa-3588nvdWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2016-4423.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2016-4423.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2016-4423.yamlghsaWEB
- github.com/symfony/symfony/pull/18733nvdWEB
- symfony.com/cve-2016-4423ghsaWEB
News mentions
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