Vulnerability in Sensiolabs Symfony
CVE-2016-4423
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.019 (78.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Sensiolabs Symfony — versions 2.7.0, 2.7.1, 2.7.2
- Debian Linux — versions 8.0
Weakness classification (CWE)
References
- symfony.com/blog/cve-2016-4423-large-username-storage-in-session (Vendor Advisory)
- github.com/symfony/symfony/pull/18733
- www.debian.org/security/2016/dsa-3588 (vendor-advisory)
Frequently asked questions
- What is CVE-2016-4423?
- CVE-2016-4423 is a high-severity vulnerability in Sensiolabs Symfony, classified under CWE-399. CVSS score: 7.5/10. Published 2016-06-01.
- How severe is CVE-2016-4423?
- High severity. CVSS v3 base score is 7.5 out of 10.