CVE-2021-35397

Exp

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.

Published: 2021-08-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-35397 is rated High Exploit Risk (77.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 4.01%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.07% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-35397

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-35397

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.94% 4.01% +1.07%
2 2025-11-21 2.43% 2.94% +0.51%
3 2025-11-18 — 2.43% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-35397

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-35397

Affected software / configurations for CVE-2021-35397

Vendor Product Version Raw CPE
drogon drogon >= 1.1.0, <= 1.6.0 cpe:2.3:a:drogon:drogon:*:*:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:-:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:beta14:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:beta15:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:beta16:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:beta17:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:beta18:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:beta19:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:beta20:*:*:*:*:*:*
drogon drogon 1.0.0 cpe:2.3:a:drogon:drogon:1.0.0:beta21:*:*:*:*:*:*

References for CVE-2021-35397

cvelogic Threat Intelligence