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Vulnerability record · CVE-2019-17147 · published 7 January 2020

CVE-2019-17147: Tp-link tl-wr841n firmware classic buffer overflow vulnerability

Tp Link · Tl Wr841n Firmware

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TP-LINK TL-WR841N routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the web service, which listens on TCP port 80 by default. When parsing the Host request header, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length static buffer. An attacker can leverage this vulnerability to execute code in the context of the admin user. Was ZDI-CAN-8457.

8.8 CVSS 3.1 High EPSS 14% · top 3.6% CWE-120 · Classic buffer overflow
8.8CVSS 3.1 base score, v2 9.3
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TP-LINK TL-WR841N routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the web service, which listens on TCP port 80 by default. When parsing the Host request header, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length static buffer. An attacker can leverage this vulnerability to execute code in the context of the admin user. Was ZDI-CAN-8457.

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

Affected products

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

References

LinkTags
https://www.tp-link.com/us/support/download/tl-wr841n/#Firmware Product
https://www.zerodayinitiative.com/advisories/ZDI-19-992/ Third Party AdvisoryVDB Entry
https://www.tp-link.com/us/support/download/tl-wr841n/#Firmware Product
https://www.zerodayinitiative.com/advisories/ZDI-19-992/ Third Party AdvisoryVDB Entry

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Related vulnerabilities

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

8.8CVE-2023-33538TP-Link router web interface command injection in WlanNetworkRpmTP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 contain a command injection flaw in the /userRpm/WlanNetworkRpm component of the route…KEVEPSS 42%analysed8.6CVE-2025-9377TP-Link Archer C7 and TL-WR841N Parental Control OS Command InjectionAn OS command injection flaw (CWE-78) exists in the Parental Control page of TP-Link Archer C7(EU) V2 and TL-WR841N/ND(MS) V9 routers, allowing an au…KEVEPSS 34%analysed7.5CVE-2015-3035TP-Link router directory traversal allows unauthenticated file readA path traversal flaw in the web interface of multiple TP-Link Archer and TL-WR/WDR router models lets a remote attacker read arbitrary files by plac…KEVEPSS 84%analysed6.5CVE-2023-50224TP-Link router httpd authentication bypass exposes stored credentialsThe httpd service on affected TP-Link router firmware contains an improper authentication flaw (CWE-290) that lets a network-adjacent attacker bypass…KEVEPSS 16%analysed9.8CVE-2022-25073Tp-link tl-wr841n firmware out-of-bounds write vulnerabilityTL-WR841Nv14_US_0.9.1_4.18 routers were discovered to contain a stack overflow in the function dm_fillObjByStr(). This vulnerability allows unauthent…EPSS 13%9.8CVE-2022-0162Tp-link tl-wr841n firmware cleartext transmission vulnerabilityThe vulnerability exists in TP-Link TL-WR841N V11 3.16.9 Build 160325 Rel.62500n wireless router due to transmission of authentication information in…EPSS 0.67%9.8CVE-2018-12575Tp-link tl-wr841n firmware improper authentication vulnerabilityOn TP-Link TL-WR841N v13 00000001 0.9.1 4.16 v0001.0 Build 171019 Rel.55346n devices, all actions in the web interface are affected by bypass of auth…EPSS 2.9%9.8CVE-2018-11714TP-Link router CGI session handling bypass allows unauthenticated actionsTP-Link TL-WR840N v5 and TL-WR841N v13 routers mishandle sessions on the /cgi/ path. Sending a Referer header of http://192.168.0.1/mainFrame.htm cau…EPSS 68%analysed

Source: NIST National Vulnerability Database (record CVE-2019-17147), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.