How severe is CVE-2020-15230?

CVE-2020-15230 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2020-15230?

CVE-2020-15230 affects the following packages: github.com/vapor/vapor (SwiftURL). Ecosystems affected: SwiftURL.

How do I fix CVE-2020-15230?

Update github.com/vapor/vapor to 4.29.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-15230 is resolved across your whole dependency graph.

How do I detect CVE-2020-15230 in my SwiftURL dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/vapor/vapor, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2020-15230 if there is no patch (or I can't update yet)?

Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Is CVE-2020-15230 actively exploited in the wild?

No public exploit code has been indexed for CVE-2020-15230 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2020-15230?

CVE-2020-15230 has an EPSS (Exploit Prediction Scoring System) score of 1.5%, placing it in the 75th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2020-15230?

CVE-2020-15230 is classified as Path Traversal (CWE-22). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2020-15230 published, and has it been updated?

CVE-2020-15230 was published on October 2, 2020 and was last updated on October 20, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦

📦 SwiftURL

Not in CISA KEV

MEDIUM severity

CVE-2020-15230 — vapor

MEDIUMFix: vapor/vapor@cf1651f

CVE-2020-15230 is a medium-severity (CVSS 6.5) Path Traversal vulnerability in github.com/vapor/vapor. A fix is available for github.com/vapor/vapor — see the affected versions and patch details below.

Arbitrary file read using percent-encoded relative paths in FileMiddleware

Also known asGHSA-vcvg-xgr8-p5gq

Published

Oct 2, 2020

Updated

Oct 20, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs75th percentile — riskier than 75% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

📦github.com/vapor/vapor

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects SwiftURL packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Attackers can access data at arbitrary filesystem paths on the same host as an application using FileMiddleware.

Patches

Version 4.29.4

Workarounds

Upgrade to 4.24.4 or later, or disable FileMiddleware.

References

Introduced in https://github.com/vapor/vapor/pull/2223
Fixed by https://github.com/vapor/vapor/pull/2500

For more information

If you have any questions or comments about this advisory:

Open an issue
Email us at [email protected]

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦SwiftURL	`github.com/vapor/vapor`	≥ 4.0.0-rc.2.5&&< 4.29.4	4.29.4

Affected Products

1 product · 1 configurations

Application

vaporvapor_project

< 4.29.4

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/vapor/vapor, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/vapor/vapor to 4.29.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-15230 is resolved across your whole dependency graph.
Workarounds
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

### Impact Attackers can access data at arbitrary filesystem paths on the same host as an application using `FileMiddleware`. ### Patches Version [4.29.4](https://github.com/vapor/vapor/releases/tag/4.29.4) ### Workarounds Upgrade to 4.24.4 or later, or disable `FileMiddleware`. ### References * Introduced in https://github.com/vapor/vapor/pull/2223 * Fixed by https://github.com/vapor/vapor/pull/2500 ### For more information If you have any questions or comments about this advisory: * Open [an issue](https://github.com/vapor/vapor/issues) * Email us at [[email protected]](mailto:se