Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-76651
StatePUBLISHED
AssignerTPLink
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 22:16:53 UTC
Updated2026-08-28 22:16:53 UTC
DescriptionA buffer overflow vulnerability exists in the embedded HTTP service in TL-WR841N v14 when processing multipart/form-data requests. Insufficient validation of an attacker-controlled boundary parameter may allow a remote unauthenticated attacker to submit a crafted request that corrupts memory by overwriting data beyond the bounds of an internal buffer. Successful exploitation may result in modification or corruption of process memory, potentially leading to undefined application behavior. Arbitrary code execution, information disclosure, and denial-of-service conditions have not been demonstrated.

Risk And Classification

Primary CVSS: v4.0 5.3 MEDIUM from f23511db-6c3e-4e32-a477-6aa17d310630

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/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

Problem Types: CWE-120 | CWE-120 CWE-120 Buffer Copy without Checking Size of Input

VersionSourceTypeScoreSeverityVector
4.0f23511db-6c3e-4e32-a477-6aa17d310630Secondary5.3MEDIUMCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS5.3MEDIUMCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
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:L/VA:N/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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TP-Link System Inc. TL-WR841N V14 affected TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478 custom Not specified
CNA TP-Link System Inc. TL-WR841N V14 affected TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588 custom Not specified

References

ReferenceSourceLinkTags
www.tp-link.com/us/support/download/tl-wr841n/v14 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com
www.tp-link.com/us/support/faq/5270 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com
www.tp-link.com/en/support/download/tl-wr841n/v14 f23511db-6c3e-4e32-a477-6aa17d310630 www.tp-link.com
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: Jincheng Wang (@winmt) from Nanjing University of Posts and Telecommunications (en)

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