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Vulnerability record · CVE-2016-2403 · published 7 February 2017

CVE-2016-2403: Sensiolabs symfony improper authentication vulnerability

Sensiolabs · Symfony

Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.

9.8 CVSS 3.0 Critical EPSS 2.9% · top 13.5% CWE-287 · Improper authentication
9.8CVSS 3.0 base score, v2 7.5
2.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://symfony.com/blog/cve-2016-2403-unauthorized-access-on-a-misconfigured-ldap-server-when-using-an-empty-password Vendor Advisory
http://www.securityfocus.com/bid/96137 Third Party AdvisoryVDB Entry
https://www.debian.org/security/2018/dsa-4262
http://symfony.com/blog/cve-2016-2403-unauthorized-access-on-a-misconfigured-ldap-server-when-using-an-empty-password Vendor Advisory
http://www.securityfocus.com/bid/96137 Third Party AdvisoryVDB Entry
https://www.debian.org/security/2018/dsa-4262

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-2403), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.