What’s Vulnerable › Vulnerabilities

CVE-2026-34122: Stack-based Buffer Overflow Leading to Denial of Service in TP-Link Tapo C520WS

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-02 · updated 2026-07-24
• Weakness: CWE-121

Description

A stack-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within a configuration handling component due to insufficient input validation. An attacker can exploit this vulnerability by supplying an excessively long value for a vulnerable configuration parameter, resulting in a stack overflow. Successful exploitation results in Denial-of-Service (DoS) condition, leading to a service crash or device reboot, impacting availability.

Affected products

• TP-Link Systems Inc. Tapo C520WS v2: before 1.2.4 — fixed in 1.2.4

How to fix

Upgrade to a fixed version: TP-Link Systems Inc. Tapo C520WS v2 1.2.4. Check the vendor advisory for mitigations.

References

• https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes
• https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes
• https://www.tp-link.com/us/support/faq/5047/

Get alerted when CVE-2026-34122 or the next vulnerability affects your stack