9.6
CRITICAL CVSS 3.1
CVE-2020-35391
Tenda N300 F3 Information Disclosure
Description

Tenda N300 F3 12.01.01.48 devices allow remote attackers to obtain sensitive information (possibly including an http_passwd line) via a direct request for cgi-bin/DownloadCfg/RouterCfm.cfg, a related issue to CVE-2017-14942. NOTE: the vulnerability report may suggest that either a ? character must be placed after the RouterCfm.cfg filename, or that the HTTP request headers must be unusual, but it is not known why these are relevant to the device's HTTP response behavior.

INFO

Published Date :

Jan. 1, 2021, 7:15 a.m.

Last Modified :

Nov. 21, 2024, 5:27 a.m.

Remotely Exploit :

No
Affected Products

The following products are affected by CVE-2020-35391 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Tenda f3_firmware
2 Tenda f3
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 LOW [email protected]
CVSS 3.1 CRITICAL [email protected]
CVSS 3.1 MEDIUM [email protected]
Public PoC/Exploit Available at Github

CVE-2020-35391 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-35391 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Python script to exploit CVE-2020-35391 on Tenda F3 V3/V4 routers, enabling unauthorized download of configuration, flash, and syslog files.

embedded-linux firmware networking router router-hacking tenda-f3-v4

Python

Updated: 1 month, 2 weeks ago
2 stars 2 fork 2 watcher
Born at : March 2, 2025, 8:12 p.m. This repo has been linked 1 different CVEs too.

None

HTML Python Shell

Updated: 1 month, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 13, 2025, 8:50 a.m. This repo has been linked 891 different CVEs too.

Tenda f3 Malformed HTTP Request Header Processing Vulnerability.

cve f3 tenda cve-2020-35391

Python

Updated: 1 year, 3 months ago
2 stars 1 fork 1 watcher
Born at : March 9, 2023, 3:36 p.m. This repo has been linked 1 different CVEs too.

Tenda N300 Authentication Bypass via Malformed HTTP Request Header

Python

Updated: 1 year, 5 months ago
1 stars 1 fork 1 watcher
Born at : Feb. 5, 2023, 1:42 p.m. This repo has been linked 2 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-35391 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-35391 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/171773/Tenda-N300-F3-12.01.01.48-Header-Processing.html
    Added Reference https://medium.com/%40signalhilltech/tenda-n300-authentication-bypass-via-malformed-http-request-header-5b8744ca685e
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://medium.com/%40signalhilltech/tenda-n300-authentication-bypass-via-malformed-http-request-header-5b8744ca685e [No types assigned]
    Removed Reference MITRE https://medium.com/@signalhilltech/tenda-n300-authentication-bypass-via-malformed-http-request-header-5b8744ca685e
  • CVE Modified by [email protected]

    Apr. 10, 2023

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/171773/Tenda-N300-F3-12.01.01.48-Header-Processing.html [No Types Assigned]
  • CWE Remap by [email protected]

    Jul. 21, 2021

    Action Type Old Value New Value
    Changed CWE CWE-416 CWE-425
  • Initial Analysis by [email protected]

    Jan. 07, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:A/AC:L/Au:N/C:P/I:N/A:N)
    Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    Changed Reference Type https://medium.com/@signalhilltech/tenda-n300-authentication-bypass-via-malformed-http-request-header-5b8744ca685e No Types Assigned https://medium.com/@signalhilltech/tenda-n300-authentication-bypass-via-malformed-http-request-header-5b8744ca685e Exploit, Third Party Advisory
    Added CWE NIST CWE-416
    Added CPE Configuration AND OR *cpe:2.3:o:tenda:f3_firmware:12.01.01.48:*:*:*:*:*:*:* OR cpe:2.3:h:tenda:f3:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 9.6
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 3.3
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

16.96 }} -6.72%

score

0.94731

percentile