CVE-2026-3622

UPnP service crash via out-of-bounds read

Published Mar 26, 2026 · Updated Mar 26, 2026

Out-of-bounds read in TP-Link TL-WR841N v14 before 0.9.1 4.19 allows remote attackers to crash UPnP via crafted local-network input. The component inadequately validates UPnP input before reading beyond a buffer boundary, terminating the UPnP service. The unauthenticated attack requires adjacent-network access and interrupts UPnP without reported device reboot, data disclosure, or modification.

CVSS severity7.1
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in TP-Link TL-WR841N v14 before 0.9.1 4.19 allows remote attackers to crash UPnP via crafted local-network input. The component inadequately validates UPnP input before reading beyond a buffer boundary, terminating the UPnP service. The unauthenticated attack requires adjacent-network access and interrupts UPnP without reported device reboot, data disclosure, or modification.

The record

CVE
CVE-2026-3622
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
TP-Link Systems Inc.
Product
TL-WR841N
Classifications
CWE-125, CAPEC-540, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.9.1 4.19

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TP-Link Systems Inc. · TL-WR841Nversion=0 <0.9.1 4.19

Published CVSS scores

7.1TP-Link Systems Inc.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
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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