CVE-2026-34122

Stack-based Buffer Overflow Leading to Denial of Service in TP-Link Tapo C520WS

MEDIUM
6.5
CVSS Score
Published: April 2, 2026 at 05:20 PM UTC
Updated: July 24, 2026 at 09:20 PM UTC
3 products affected across 1 vendorTapo C520WS FirmwareTapo C520WSLink Tapo C520WS

Using Tapo C520WS v2.6 by TP-Link Systems Inc.?

Get instant alerts when new vulnerabilities affect Tapo C520WS v2.6 - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM6.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.2.4
Affected range stops below 1.2.4, so it looks safe — our inference, not a vendor statement
tp-link-tapo-c520ws (same device)
v < 1.2.4 Build 260326 Rel.24666n
Affected range stops below 1.2.4 Build 260326 Rel.24666n, so it looks safe — our inference, not a vendor statement
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card