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Vulnerability record · CVE-2020-36178 · published 6 January 2021

CVE-2020-36178: Tp-link tl-wr840n firmware os command injection vulnerability

Tp Link · Tl Wr840n Firmware

oal_ipt_addBridgeIsolationRules on TP-Link TL-WR840N 6_EU_0.9.1_4.16 devices allows OS command injection because a raw string entered from the web interface (an IP address field) is used directly for a call to the system library function (for iptables). NOTE: oal_ipt_addBridgeIsolationRules is not the only function that calls util_execSystem.

9.8 CVSS 3.1 Critical EPSS 9.7% · top 4.6% CWE-78 · OS command injection
9.8CVSS 3.1 base score, v2 10.0
9.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

oal_ipt_addBridgeIsolationRules on TP-Link TL-WR840N 6_EU_0.9.1_4.16 devices allows OS command injection because a raw string entered from the web interface (an IP address field) is used directly for a call to the system library function (for iptables). NOTE: oal_ipt_addBridgeIsolationRules is not the only function that calls util_execSystem.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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://github.com/therealunicornsecurity/therealunicornsecurity.github.io/blob/master/_posts/2020-10-11-TPLink.md ExploitThird Party Advisory
https://therealunicornsecurity.github.io/TPLink/ ExploitThird Party Advisory
https://www.tp-link.com/fr/support/download/tl-wr840n/v6/#Firmware Vendor Advisory
https://github.com/therealunicornsecurity/therealunicornsecurity.github.io/blob/master/_posts/2020-10-11-TPLink.md ExploitThird Party Advisory
https://therealunicornsecurity.github.io/TPLink/ ExploitThird Party Advisory
https://www.tp-link.com/fr/support/download/tl-wr840n/v6/#Firmware Vendor Advisory

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Related vulnerabilities

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

6.5CVE-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-2022-25060Tp-link tl-wr840n firmware os command injection vulnerabilityTP-LINK TL-WR840N(ES)_V6.20_180709 was discovered to contain a command injection vulnerability via the component oal_startPing.EPSS 40%9.8CVE-2022-25061TP-Link TL-WR840N router command injection in oal_setIp6DefaultRouteThe TP-Link TL-WR840N(ES) V6.20 firmware (build 180709) contains an OS command injection flaw in the oal_setIp6DefaultRoute component. Because the fl…EPSS 59%analysed9.8CVE-2022-25064Tp-link tl-wr840n firmware os command injection vulnerabilityTP-LINK TL-WR840N(ES)_V6.20_180709 was discovered to contain a remote code execution (RCE) vulnerability via the function oal_wan6_setIpAddr.EPSS 36%9.8CVE-2021-41653TP-Link TL-WR840N router PING function command injection RCEThe PING diagnostic function on the TP-Link TL-WR840N EU v5 router (firmware through TL-WR840N(EU)_V5_171211) fails to sanitize the IP address input …EPSS 76%analysed9.8CVE-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%analysed8.8CVE-2023-39471Tp-link tl-wr841n firmware os command injection vulnerabilityTP-Link TL-WR841N ated_tp Command Injection Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbi…EPSS 0.91%8.8CVE-2019-15060Tp-link tl-wr840n firmware os command injection vulnerabilityThe traceroute function on the TP-Link TL-WR840N v4 router with firmware through 0.9.1 3.16 is vulnerable to remote code execution via a crafted payl…EPSS 4.0%

Source: NIST National Vulnerability Database (record CVE-2020-36178), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.