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CVE-2018-11407

31
FAUCET Score

CVE-2018-11407 is a critical authentication bypass vulnerability affecting the Ldap component in multiple versions of Symfony (2.8.x, 3.3.x, 3.4.x, and 4.0.x). This flaw allows remote attackers to log in with a valid username and a "null" password, leading to an unauthenticated bind and complete compromise of confidentiality, integrity, and availability. With a CVSS score of 9.8 (CRITICAL) and a FAUCET Risk Score of 92/100, this vulnerability is easily exploitable over the network with low attack complexity and no user interaction required. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.8.0, < 2.8.37CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 3.3.0, < 3.3.17CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 3.4.0, < 3.4.7CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*
>= 4.0.0, < 4.0.7CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.34%
Probability of exploitation in next 30 days
EPSS Percentile
81.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0234 is in the 72nd percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (12)

composerpatch availablevia ghsa
Product: symfony/security-coreFixed in: 2.8.37
composerpatch availablevia ghsa
Product: symfony/security-coreFixed in: 3.3.17
composerpatch availablevia ghsa
Product: symfony/security-coreFixed in: 3.4.7
composerpatch availablevia ghsa
Product: symfony/security-coreFixed in: 4.0.7
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 2.8.37
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 3.3.17
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 3.4.7
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 4.0.7
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 2.8.37
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 3.3.17
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 3.4.7
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 4.0.7

Vendor Advisories (1)

composerGHSA-35c5-28pg-2qg4critical

Symfony Authentication Bypass

May 14, 2022

References

symfony.com / blog/cve-2018-11407-unauthorized-access-on-a-misconfigured-ldap-server-when-using-an-empty-password
Vendor Advisory