CVE-2021-35397

Name: CVE-2021-35397
Creator: NVD / NIST
Published: 2021-08-04T11:15:08.003+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.01%

Last modified Jun 17, 2026

CVE-2021-35397 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A path traversal vulnerability in the static router for Drogon from 1.0.0-beta14 to 1.6.0 could allow an unauthenticated, remote attacker to arbitrarily read files. The vulnerability is due to lack of proper input validation for requested path. EPSS estimates a 4.01% chance of exploitation in the next 30 days.

Description

A path traversal vulnerability in the static router for Drogon from 1.0.0-beta14 to 1.6.0 could allow an unauthenticated, remote attacker to arbitrarily read files. The vulnerability is due to lack of proper input validation for requested path. An attacker could exploit this vulnerability by sending crafted HTTP request with specific path to read. Successful exploitation could allow the attacker to read files that should be restricted.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

4.01%

89.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Drogon	Drogon	>= 1.1.0, <= 1.6.0
Drogon	Drogon	1.0.0

References

https://github.com/an-tao/drogonThird Party Advisory
https://github.com/an-tao/drogon/blob/834e3eabdd0441ad2bc80c02e8bbfc3b8312c213/lib/src/StaticFileRouter.cc#L62-L67Exploit, Third Party Advisory
https://github.com/an-tao/drogon/wiki/ENG-02-InstallationThird Party Advisory
https://github.com/an-tao/drogon/wiki/ENG-03-Quick-Start#Static-SiteThird Party Advisory
https://github.com/an-tao/drogonThird Party Advisory
https://github.com/an-tao/drogon/blob/834e3eabdd0441ad2bc80c02e8bbfc3b8312c213/lib/src/StaticFileRouter.cc#L62-L67Exploit, Third Party Advisory
https://github.com/an-tao/drogon/wiki/ENG-02-InstallationThird Party Advisory
https://github.com/an-tao/drogon/wiki/ENG-03-Quick-Start#Static-SiteThird Party Advisory

Timeline

Published: Aug 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35397?

How severe is CVE-2021-35397?

CVE-2021-35397 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.01% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35397?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35397?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST