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Vulnerability record · CVE-2022-43636 · published 29 March 2023

CVE-2022-43636: Tp-link tl-wr940n firmware vulnerability

Tp Link · Tl Wr940n Firmware

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of TP-Link TL-WR940N 6_211111 3.20.1(US) routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the httpd service, which listens on TCP port 80 by default. The issue results from the lack of sufficient randomness in the sequnce numbers used for session managment. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-18334.

8.8 CVSS 3.1 High EPSS 0.91% · top 41.8% CWE-330 · CWE-330
8.8CVSS 3.1 base score
0.91%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of TP-Link TL-WR940N 6_211111 3.20.1(US) routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the httpd service, which listens on TCP port 80 by default. The issue results from the lack of sufficient randomness in the sequnce numbers used for session managment. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-18334.

CVSS:3.1/AV:A/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://www.zerodayinitiative.com/advisories/ZDI-22-1614/ Third Party AdvisoryVDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-1614/ 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%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%analysed9.9CVE-2023-36355Tp-link tl-wr940n firmware classic buffer overflow vulnerabilityTP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart parameter at /userRpm/WanDynamicIpV6CfgRpm. This vulnerability allow…EPSS 32%8.8CVE-2022-24355Tp-link tl-wr940n firmware stack-based buffer overflow vulnerabilityThis vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link TL-WR940N 3.20.1 Build 200316 Rel…EPSS 2.1%8.8CVE-2019-6989Tp-link tl-wr940n firmware out-of-bounds write vulnerabilityTP-Link TL-WR940N is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the ipAddrDispose function. By sending specia…EPSS 12%8.5CVE-2026-11409Tp-link tl-wr940n firmware os command injection vulnerabilityAn authenticated OS command injection vulnerability exists in the IPv6 PPPoE configuration handler in TL-WR940N v6 due to improper sanitization of us…EPSS 2.8%8.5CVE-2026-11410Tp-link tl-wr940n firmware os command injection vulnerabilityAn authenticated OS command injection vulnerability exists in the BigPond Cable (BPA) WAN configuration module in TL-WR940N v6 due to improper saniti…EPSS 2.8%8.2CVE-2025-6151Tp-link tl-wr940n firmware memory buffer overflow vulnerabilityA vulnerability has been found in TP-Link TL-WR940N V4 and TL-WR841N V11. Affected by this issue is some unknown functionality of the file /userRpm/W…EPSS 5.0%

Source: NIST National Vulnerability Database (record CVE-2022-43636), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.