← Vulnerability feed

Vulnerability record · CVE-2020-35391 · published 1 January 2021

CVE-2020-35391: Tenda f3 firmware vulnerability

Tenda · F3 Firmware

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.

6.5 CVSS 3.1 Medium EPSS 35% · top 1.6% CWE-425 · CWE-425
6.5CVSS 3.1 base score, v2 3.3
35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/171773/Tenda-N300-F3-12.01.01.48-Header-Processing.html
https://medium.com/%40signalhilltech/tenda-n300-authentication-bypass-via-malformed-http-request-header-5b8744ca685e
http://packetstormsecurity.com/files/171773/Tenda-N300-F3-12.01.01.48-Header-Processing.html
https://medium.com/%40signalhilltech/tenda-n300-authentication-bypass-via-malformed-http-request-header-5b8744ca685e

Track CVE-2020-35391 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.1CVE-2026-27514Tenda f3 firmware vulnerabilityShenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi contains a sensitive information exposure vulnerability in the configuration download f…EPSS 0.39%5.6CVE-2025-57569Tenda f3 firmware classic buffer overflow vulnerabilityTenda F3 V12.01.01.48_multi and after is vulnerable to Buffer Overflow via the portList parameter in /goform/setNAT.EPSS 0.20%5.6CVE-2025-57570Tenda f3 firmware classic buffer overflow vulnerabilityTenda F3 V12.01.01.48_multi and after is vulnerable to Buffer Overflow via the QosList parameter in goform/setQoS.EPSS 0.20%5.6CVE-2025-57571Tenda f3 firmware classic buffer overflow vulnerabilityTenda F3 V12.01.01.48_multi and after is vulnerable to Buffer Overflow. via the macFilterList parameter in goform/setNAT.EPSS 0.20%5.6CVE-2025-57572Tenda f3 firmware classic buffer overflow vulnerabilityTenda F3 V12.01.01.48_multi and after is vulnerable to Buffer Overflow via the onlineList parameter in goform/setParentControl.EPSS 0.22%5.6CVE-2025-57573Tenda f3 firmware classic buffer overflow vulnerabilityTenda F3 V12.01.01.48_multi and after is vulnerable to Buffer Overflow via the wifiTimeClose parameter in goform/setWifi.EPSS 0.22%5.1CVE-2026-27511Tenda f3 firmware clickjacking vulnerabilityShenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi contains a clickjacking vulnerability in the web-based administrative interface. The in…EPSS 0.33%5.1CVE-2026-27512Tenda f3 firmware cross-site scripting vulnerabilityShenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi contains a content-type confusion vulnerability in the administrative interface. Respon…EPSS 0.33%

Source: NIST National Vulnerability Database (record CVE-2020-35391), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.