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CVE-2021-35397

25
FAUCET Score

CVE-2021-35397 is a path traversal vulnerability affecting Drogon versions 1.0.0-beta14 through 1.6.0, stemming from insufficient input validation in its static router. This allows an unauthenticated, remote attacker to read arbitrary files by crafting malicious HTTP requests. The vulnerability carries a CVSS score of 7.5 (HIGH), indicating a high potential for confidentiality impact without requiring user interaction or complex attack techniques. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.1.0, <= 1.6.0CPE matchmatch criteria
cpe:2.3:a:drogon:drogon:*:*:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:drogon:drogon:1.0.0:-:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:drogon:drogon:1.0.0:beta14:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:drogon:drogon:1.0.0:beta15:*:*:*:*:*:*
1.0.0CPE matchmatch criteria
cpe:2.3:a:drogon:drogon:1.0.0:beta16:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.01%
Probability of exploitation in next 30 days
EPSS Percentile
89.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0401 is in the 81st percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / an-tao/drogon
Third Party Advisory
github.com / an-tao/drogon/blob/834e3eabdd0441ad2bc80c02e8bbfc3b8312c213/lib/src/StaticFileRouter.cc
ExploitThird Party Advisory
github.com / an-tao/drogon/wiki/ENG-02-Installation
Third Party Advisory
github.com / an-tao/drogon/wiki/ENG-03-Quick-Start
Third Party Advisory