CVE-2023-36354Public exploitNetwork attack vector

Device crash via oversized Changed parameter

Published Jun 22, 2023 · Updated Dec 2, 2024

Buffer overflow in TP-Link TL-WR740N, TL-WR841N, TL-WR940N, and TL-WR941ND routers allows remote attackers to crash devices via a GET request. In hardware versions TL-WR740N 1/2, TL-WR841N 8/10, TL-WR940N 2/3/4, and TL-WR941ND 5/6, the handler copies an oversized Changed query value without checking its destination buffer. No authentication or user interaction is required; exploitation interrupts router service, with no reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in TP-Link TL-WR740N, TL-WR841N, TL-WR940N, and TL-WR941ND routers allows remote attackers to crash devices via a GET request. In hardware versions TL-WR740N 1/2, TL-WR841N 8/10, TL-WR940N 2/3/4, and TL-WR941ND 5/6, the handler copies an oversized Changed query value without checking its destination buffer. No authentication or user interaction is required; exploitation interrupts router service, with no reported data disclosure or modification.

The record

CVE
CVE-2023-36354
Published
Jun 22, 2023
Updated
Dec 2, 2024
Vendor
TP-Link
Product
TL-WR940N
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2024Record 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=2
  2. Affected versionversion=3
  3. Affected versionversion=4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TP-Link · TL-WR940Nversion=2; version=3; version=4
TP-Link · TL-WR941NDversion=5; version=6
TP-Link · TL-WR740Nversion=1; version=2
TP-Link · TL-WR841Nversion=10; version=8

Published CVSS scores

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.

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No observations available

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

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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