CVE-2016-4423

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.86% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 77.8% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2016-06-01 22:00Z10 YR AGO

Last updated

2024-08-06 00:32Z2 YR AGO

Reserved

2016-05-02

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-399

Data version

5.1

Document digest

383fa864ba6ac36c16be889f37395de3d427512fb4217f7d77f5d7dbc682fdb2

• symfony.comhttps://symfony.com/blog/cve-2016-4423-large-username-storage-in-sessionx_refsource_CONFIRM
• github.comhttps://github.com/symfony/symfony/pull/18733x_refsource_CONFIRM
• www.debian.orgDSA-3588http://www.debian.org/security/2016/dsa-3588vendor-advisoryx_refsource_DEBIAN