CVE-2024-50340 is a high-severity (CVSS 7.3) CWE-74 vulnerability in symfony/runtime. 2 public exploit references exist, so weaponization risk is real. A fix is available for symfony/runtime — see the affected versions and patch details below.
Ability to change environment from query in symfony/runtime
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-50340.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2024-50340 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE sits: patch-first territory.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the 50–90% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
symfony/runtime🐘symfony/runtime🐘symfony/runtime🐘symfony/symfony🐘symfony/symfony🐘symfony/symfonyReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
symfony/runtime is a module for the Symphony PHP framework which enables decoupling PHP applications from global state. When the register_argv_argc php directive is set to on , and users call any URL with a special crafted query string, they are able to change the environment or debug mode used by the kernel when handling the request. As of versions 5.4.46, 6.4.14, and 7.1.7 the SymfonyRuntime now ignores the argv values for non-SAPI PHP runtimes. All users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | symfony/runtime | ≥ 5.3.0&&< 5.4.46 | 5.4.46composer require symfony/runtime:^5.4.46 |
| 🐘Packagist | symfony/runtime | ≥ 6.0.0&&< 6.4.14 | 6.4.14composer require symfony/runtime:^6.4.14 |
| 🐘Packagist | symfony/runtime | ≥ 7.0.0&&< 7.1.7 | 7.1.7composer require symfony/runtime:^7.1.7 |
| 🐘Packagist | symfony/symfony | ≥ 5.3.0&&< 5.4.46 | 5.4.46composer require symfony/symfony:^5.4.46 |
| 🐘Packagist | symfony/symfony | ≥ 6.0.0&&< 6.4.14 | 6.4.14composer require symfony/symfony:^6.4.14 |
| 🐘Packagist | symfony/symfony | ≥ 7.0.0&&< 7.1.7 | 7.1.7composer require symfony/symfony:^7.1.7 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for symfony/runtime, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update symfony/runtime to 5.4.46 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-50340 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2024-50340 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2024-50340. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
How to detect CVE-2024-50340
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2024-50340 -u https://target- Template
- Symfony Profiler - Remote Access via Injected Arguments
- Severity
- high
- Impact
- Attackers can exploit vulnerabilities to compromise the system.
- Remediation
- Update to the latest patched version addressing CVE-2024-50340.
Template by ProjectDiscovery nuclei-templates (DhiyaneshDK), MIT licensed. View the full template. Scan only systems you are authorised to test.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Frequently Asked Questions
Is CVE-2024-50340 in your dependencies?
O3 Security finds CVE-2024-50340 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.