Null Pointer Dereference in Tapo SmartCam HTTP Service on TP-Link Tapo C220 & C520WS

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Summary

CVECVE-2026-0918
StatePUBLISHED
AssignerTPLink
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-27 18:15:54 UTC
Updated2026-04-29 01:16:02 UTC
DescriptionThe Tapo C100 v5, C220 v1 and C520WS v2 cameras’ HTTP service does not safely handle POST requests containing an excessively large Content-Length header. The resulting failed memory allocation triggers a NULL pointer dereference, causing the main service process to crash. An unauthenticated attacker can repeatedly crash the service, causing temporary denial of service. The device restarts automatically, and repeated requests can keep it unavailable.

Risk And Classification

Primary CVSS: v4.0 7.1 HIGH from f23511db-6c3e-4e32-a477-6aa17d310630

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000350000 probability, percentile 0.102360000 (date 2026-05-05)

Problem Types: CWE-476 | CWE-476 CWE-476 NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
4.0f23511db-6c3e-4e32-a477-6aa17d310630Secondary7.1HIGHCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS7.1HIGHCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Tp-link Tapo C220 1 All All All
Operating System Tp-link Tapo C220 Firmware All All All All
Hardware Tp-link Tapo C520ws 2 All All All
Operating System Tp-link Tapo C520ws Firmware All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TP-Link Systems Inc. Tapo C220 V1 affected 1.4.2 Build 251112 custom Not specified
CNA TP-Link Systems Inc. Tapo C520WS V2 affected 1.2.3 Build 251114 custom Not specified
CNA TP-Link Systems Inc. Tapo C100 V5 affected 1.4.3 Build 251128 custom Not specified

References

ReferenceSourceLinkTags
www.crac-learning.com/post/smart-home-security-research-cve-2026-0918-assigned f23511db-6c3e-4e32-a477-6aa17d310630 www.crac-learning.com
www.tp-link.com/en/support/download/tapo-c520ws/v2 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com Product
www.tp-link.com/us/support/download/tapo-c100/v5 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com Product
www.tp-link.com/en/support/download/tapo-c220/v1 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com Product
www.tp-link.com/us/support/download/tapo-c220/v1.60 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com Product
www.tp-link.com/us/support/download/tapo-c520ws/v2 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com Product
www.tp-link.com/us/support/faq/4923 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Diogo Almeida @NeWbie (en)

CNA: Azim Javed & Ayushman Agrawal Hingorani from CRAC Learning (en)

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