CRITICAL
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
Published Feb 7, 2017
9.8
CRITICALCVSS 3.0
EPSS 2.93%
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.
Affected products
No data.
OR
- 2.8.0
- 2.8.1
- 2.8.2
- 2.8.3
- 2.8.4
- 2.8.5
- 3.0.0
- 3.0.1
- 3.0.2
- 3.0.3
- 3.0.4
- 3.0.5
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.93% 0.02925
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02925
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.93% (0.02925) | 86.58th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.93% (0.02925) | 85.22th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.15% (0.00154) | 33.55th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.58% (0.00582) | 78.84th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.58% (0.00582) | 77.44th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.58% (0.00582) | 74.78th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.14% (0.01136) | 59.45th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.14% (0.01136) | 58.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.14% (0.01136) | 56.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.14% (0.01136) | 34.23th | v2 (v2022.01.01) |
Weaknesses (1)
References (10)
- http://symfony.com/blog/cve-2016-2403-unauthorized-access-on-a-misconfigured-ldap-server-when-using-an-empty-password x_refsource_CONFIRMVendor Advisory
- http://www.securityfocus.com/bid/96137 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-core/CVE-2016-2403.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2016-2403.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2016-2403.yaml
- https://github.com/advisories/GHSA-wvj5-r78r-hhfq Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-2403
- https://symfony.com/cve-2016-2403
- https://web.archive.org/web/20210123224944/http://www.securityfocus.com/bid/96137
- https://www.debian.org/security/2018/dsa-4262 vendor-advisoryx_refsource_DEBIAN
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Feb 7, 2017
Updated Aug 5, 2024
Reserved Feb 18, 2016
Link CVE-2016-2403
CISA Vulnrichment
GHSA-WVJ5-R78R-HHFQ Updated n/a