TP-Link TL-WR940N V4, TL-WR841N V8/V10, TL-WR940N V2/V3 and TL-WR941ND V5/V6 were discovered to contain a buffer overflow in the component /

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• tp-link tl-wr841n firmwareall versions
• tp-link tl-wr940n firmwareall versions
• tp-link tl-wr941nd firmwareall versions

Other highest-scoring records for the same primary product.

• CVE-2023-33538TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain a command injection vulnerability via the componentKEV
  77This week
• CVE-2023-36355TP-Link TL-WR940N V4 was discovered to contain a buffer overflow via the ipStart parameter at /userRpm/WanDynamicIpV6CfgRpm.
  49Plan
• CVE-2019-6989TP-Link TL-WR940N is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the ipAddrDispose function.
  38Monitor
• CVE-2022-24355This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link TL-WR940N 3.20.1 Build 2
  36Monitor
• CVE-2026-11410OS Command Injection in BigPond Cable (BPA) Configuration in TP-Link TL-WR940N
  35Monitor
• CVE-2026-11409OS Command Injection in IPv6 PPPoE Configuration in TP-Link TL-WR940N
  35Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1char buf[256];2memcpy(buf, pkt->data, pkt->len);

1char buf[256];2if (pkt->len > sizeof(buf)) {3  return -EINVAL;4}5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.