CVE-2016-2403 json
Symfony Authentication Bypass
published 2017-02-07 9 y ago modified 2026-06-17 4 mo ago also GHSA-wvj5-r78r-hhfq , EUVD-2022-5646
- cvss
- 9.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.3%
- EPSS 4.3% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist symfony/security-core 2.8.6, 3.0.6
- packagist symfony/security 2.8.6, 3.0.6
- packagist symfony/symfony 2.8.6, 3.0.6
- symfony Debian 14, Debian 13, Debian 12 2.8.6+dfsg-1
debian advisories DEBIAN-CVE-2016-2403
Exploit prediction
4.29% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | symfony/security-core | >=2.8.0, <2.8.6 >=3.0.0, <3.0.6 |
2.8.6 3.0.6 |
| packagist | symfony/security | >=2.8.0, <2.8.6 >=3.0.0, <3.0.6 |
2.8.6 3.0.6 |
| packagist | symfony/symfony | >=2.8.0, <2.8.6 >=3.0.0, <3.0.6 |
2.8.6 3.0.6 |
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
debian.org
/security/2018/dsa-4262
vendor-advisory, web
-
symfony.com
/blog/cve-2016-2403-unauthorized-access-on-a-misconfigured-ldap-server-when-using-an-empty-password
web, vendor-advisory
-
securityfocus.com
/bid/96137
vdb-entry, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2016-2403
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/security-core/CVE-2016-2403.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2016-2403.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2016-2403.yaml
web
-
symfony.com
/cve-2016-2403
web
-
web.archive.org
/web/20210123224944/http://www.securityfocus.com/bid/96137
web
Sources
- CVE List CVE-2016-2403
- GitHub Advisory GHSA-wvj5-r78r-hhfq
- NVD CVE-2016-2403
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.