What is the CVSS score of CVE-2016-1902?

CVE-2016-1902 has a CVSS 3.0 base score of 7.5 (High). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.4%.

Is there a patch available for CVE-2016-1902?

Yes, a patch is available for CVE-2016-1902. Update the affected software to the latest version immediately.

Symfony CVE-2016-1902

HIGH

Cryptographic Issues (CWE-310)

2016-06-01 cve@mitre.org

PHP Information Disclosure Debian Debian Linux Symfony Sensiolabs

7.5

CVSS 3.0 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-310 OWASP Top 10:2025 A04:2025 - Cryptographic Failures ASVS 5.0 V11 - Cryptography Cryptographic controls
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.40%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.4% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

The nextBytes function in the SecureRandom class in Symfony before 2.3.37, 2.6.x before 2.6.13, and 2.7.x before 2.7.9 does not properly generate random numbers when used with PHP 5.x without the. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected Packages

composer symfony/security fix: 2.3.37, 2.6.13, 2.7.9

composer symfony/security-core fix: 2.6.13, 2.7.9

composer symfony/symfony fix: 2.3.37, 2.6.13, 2.7.9

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 3 packages in composer

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-310. The nextBytes function in the SecureRandom class in Symfony before 2.3.37, 2.6.x before 2.6.13, and 2.7.x before 2.7.9 does not properly generate random numbers when used with PHP 5.x without the paragonie/random_compat library and the openssl_random_pseudo_bytes function fails, which makes it easier for attackers to defeat cryptographic protection mechanisms via unspecified vectors. Affected products include: Debian Debian Linux, Sensiolabs Symfony. Version information: before 2.3.37.

Know when Symfony gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionCVE.org

The nextBytes function in the SecureRandom class in Symfony before 2.3.37, 2.6.x before 2.6.13, and 2.7.x before 2.7.9 does not properly generate random numbers when used with PHP 5.x without the paragonie/random_compat library and the openssl_random_pseudo_bytes function fails, which makes it easier for attackers to defeat cryptographic protection mechanisms via unspecified vectors.

Threat Intelligence Overview

EPSS Score

0.4%

Top 40% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.4%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.0:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.1:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.2:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.3:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.4:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.5:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.6:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.7:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.8:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.9:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.10:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.11:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.6.12:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.7.0:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.7.1:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.7.2:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.7.3:*:*:*:*:*:*:*

cpe:2.3:a:sensiolabs:symfony:2.7.4:*:*:*:*:*:*:*

+ 4 more

More in Symfony

View all

CVE-2015-4050 MEDIUM This Month POC

4.3 Jun 02

FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.1

CVE-2019-10910 CRITICAL Act Now POC

9.8 May 16

In Symfony before 2.7.51, 2.8.x before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and 4.2.x before 4.2.7, when servic

CVE-2018-13818 CRITICAL Act Now POC

9.8 Jul 10

Twig before 2.4.4 allows Server-Side Template Injection (SSTI) via the search search_key parameter. Rated critical sever

CVE-2026-100872 HIGH This Week POC

8.7 Sep 27

Insufficient verification of payment-claim state in the Sylius e-commerce platform (versions before 2.1.16 and 2.2.9) le

CVE-2026-100869 HIGH This Week POC

8.2 Sep 27

Incorrect authorization in the Sylius Shop API lets anyone holding an order token submit arbitrary payment actions - mos

CVE-2025-64500 HIGH This Week POC

7.3 Nov 12

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Rated high severity (C

CVE-2026-24739 MEDIUM This Month POC

6.3 Jan 28

Symfony versions up to 5.4.51 contains a vulnerability that allows attackers to operations being performed on an uninten

CVE-2018-12040 MEDIUM This Month POC

6.1 Jun 13

Reflected Cross-site scripting (XSS) vulnerability in the web profiler in SensioLabs Symfony 3.3.6 allows remote attacke

CVE-2016-2403 CRITICAL Act Now

9.8 Feb 07

Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty p

CVE-2024-51736 CRITICAL Act Now

9.8 Nov 06

Symphony process is a module for the Symphony PHP framework which executes commands in sub-processes. Rated critical sev

CVE-2019-18889 CRITICAL Act Now

9.8 Nov 21

An issue was discovered in Symfony 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. Rated critical s

CVE-2019-11325 CRITICAL Act Now

9.8 Nov 21

An issue was discovered in Symfony before 4.2.12 and 4.3.x before 4.3.8. Rated critical severity (CVSS 9.8), this vulner

Same weakness CWE-310 – Cryptographic Issues

View all

CVE-2015-0204 MEDIUM POC

4.3

CVE-2015-4000 LOW POC

3.7

CVE-2014-3566 LOW POC

3.4

CVE-2014-8684 CRITICAL POC

9.8

CVE-2012-1803 HIGH POC

8.5

CVE-2013-4787 CRITICAL POC

9.3

CVE-2014-8686 CRITICAL POC

9.8

CVE-2013-0137 CRITICAL

10.0

Same technique Information Disclosure

View all

CVE-2019-2725 CRITICAL POC

9.8

CVE-2021-34523 CRITICAL POC

9.0

CVE-2013-2251 CRITICAL POC

9.8

CVE-2017-5638 CRITICAL POC

9.8

CVE-2025-24813 CRITICAL POC

9.8

CVE-2025-68613 HIGH POC

8.8

CVE-2015-1701 HIGH POC

7.8

CVE-2017-0147 HIGH POC

7.5

References

Advisories & patches

PATCH https://github.com/symfony/symfony/pull/17359 ADVISORY http://symfony.com/blog/cve-2016-1902-securerandom-s-fallback-not-secure-when-openssl-fails REF http://www.debian.org/security/2016/dsa-3588 REF https://www.landaire.net/blog/cve-2016-1902-symfony-securerandom/

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back