CVE-2020-5777 — dweeves/magmi
CRITICALCVE-2020-5777 is a critical-severity (CVSS 9.8) Improper Authentication vulnerability in dweeves/magmi. EPSS puts its 30-day exploitation probability at 23.3% (98th percentile). A fix is available for dweeves/magmi — see the affected versions and patch details below.
Authentication bypass in MAGMI
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-2020-5777 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,238 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
dweeves/magmiReal-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
MAGMI versions prior to 0.7.24 are vulnerable to a remote authentication bypass due to allowing default credentials in the event there is a database connection failure. A remote attacker can trigger this connection failure if the Mysql setting max_connections (default 151) is lower than Apache (or another web server) setting MaxRequestWorkers (formerly MaxClients) (default 256). This can be done by sending at least 151 simultaneous requests to the Magento website to trigger a "Too many connections" error, then use default magmi:magmi basic authentication to remotely bypass authentication.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | dweeves/magmi | all versions | 0.7.24composer require dweeves/magmi:^0.7.24 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for dweeves/magmi, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update dweeves/magmi to 0.7.24 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-5777 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-2020-5777 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2020-5777. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
How to detect CVE-2020-5777
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2020-5777 -u https://target- Template
- Magento Mass Importer <0.7.24 - Remote Auth Bypass
- Severity
- critical
- Impact
- An attacker can bypass authentication and gain unauthorized access to the Magento Mass Importer plugin.
- Remediation
- Upgrade to version 0.7.24 or later to fix the authentication bypass vulnerability.
Template by ProjectDiscovery nuclei-templates (dwisiswant0), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2020-5777 in your dependencies?
O3 Security finds CVE-2020-5777 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.