9.8

CVE-2016-2403: sensiolabs symfony Improper Authentication

CVSS: 9.8v3.0CriticalModified
AliasesUBUNTU-CVE-2016-2403DEBIAN-CVE-2016-2403
Published 07-02-2017Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2016-2403 is a critical (CVSS 9.8) Improper Authentication vulnerability in sensiolabs symfony. EPSS estimates a 4.29% chance of exploitation in the next 30 days, higher than 91% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.0 (NVD)
EPSS score
4.29%
0%100%
Low · +1.36 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
DSA-4262-1

Timeline

  1. 07-02-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

4.29%

Chance of exploitation in the next 30 days

Percentile

91%

Versus all other CVEs

30-day change

+1.36 pp

From 2.93% on 19-09-2026

19-09-202619-10-2026
EPSS score
4.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • symfony< 2.8.6+dfsg-1
Sensiolabs1 product
  • symfonyEOL2.8.0 | 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
Ubuntu1 product
  • symfony< 3.4.6+dfsg-1

3 vendors · 3 products

References

6 links