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Vulnerability record · CVE-2023-36355 · published 22 June 2023

CVE-2023-36355: Tp-link tl-wr940n firmware classic buffer overflow vulnerability

Tp Link · Tl Wr940n Firmware

TP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart parameter at /userRpm/WanDynamicIpV6CfgRpm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted GET request.

9.9 CVSS 3.1 Critical EPSS 32% · top 1.8% CWE-120 · Classic buffer overflow
9.9CVSS 3.1 base score
32%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

TP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart parameter at /userRpm/WanDynamicIpV6CfgRpm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted GET request.

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

Affected products

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

References

LinkTags
http://packetstormsecurity.com/files/173294/TP-Link-TL-WR940N-4-Buffer-Overflow.html
https://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/9/TP-Link%20TL-WR940N%20wireless%20router%20userRpmWanDynamicIp ExploitThird Party Advisory
http://packetstormsecurity.com/files/173294/TP-Link-TL-WR940N-4-Buffer-Overflow.html
https://github.com/a101e-IoTvul/iotvul/blob/main/tp-link/9/TP-Link%20TL-WR940N%20wireless%20router%20userRpmWanDynamicIp ExploitThird Party Advisory

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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%analysed8.8CVE-2022-43636Tp-link tl-wr940n firmware vulnerabilityThis vulnerability allows network-adjacent attackers to bypass authentication on affected installations of TP-Link TL-WR940N 6_211111 3.20.1(US) rout…EPSS 0.91%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 11%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-2023-36355), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.