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CVE-2016-4423

N/A
Published: June 1, 2016 at 10:00 PM UTC
Updated: June 17, 2026 at 12:47 AM UTC
2 products affected across 2 vendorsDebian LinuxSymfony

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Severity
N/A
Exploit prediction
EPSS 2%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Vendor Advisoryx_refsource_DEBIAN
Source: [email protected]
http://www.debian.org/security/2016/dsa-3588
x_refsource_CONFIRM
Source: [email protected]
https://github.com/symfony/symfony/pull/18733
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://symfony.com/blog/cve-2016-4423-large-username-storage-in-session

CVSS

5MEDIUM[email protected]
Confidentiality
NONE
Integrity
NONE
Availability
PARTIAL
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-399

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