CVE-2024-12343Public exploit

Router crash via oversized SOAP connection type

Published Dec 8, 2024 · Updated Dec 9, 2024

Buffer overflow in the WANIPConnection SOAP handler in TP-Link VN020-F3v TT_V6.2.1021 allows remote attackers to crash the router. The SetConnectionType action accepts an oversized NewConnectionType value from a SOAP POST without enforcing a safe input length, corrupting memory and making the device unresponsive. Access to the router's local network and its unauthenticated UPnP service on TCP port 5431 is required; a successful request can force a reboot or leave the router frozen until manual intervention.

CVSS severity7.1
High
EPSS probability4.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer overflow in the WANIPConnection SOAP handler in TP-Link VN020-F3v TT_V6.2.1021 allows remote attackers to crash the router. The SetConnectionType action accepts an oversized NewConnectionType value from a SOAP POST without enforcing a safe input length, corrupting memory and making the device unresponsive. Access to the router's local network and its unauthenticated UPnP service on TCP port 5431 is required; a successful request can force a reboot or leave the router frozen until manual intervention.

The record

CVE
CVE-2024-12343
Published
Dec 8, 2024
Updated
Dec 9, 2024
Vendor
TP-Link
Product
VN020-F3v
Classifications
CWE-120, CWE-119, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 9, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=TT_V6.2.1021

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TP-Link · VN020-F3vversion=TT_V6.2.1021

Published CVSS scores

6.5VulDB CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.1VulDB CNAAV:A/AC:L/Au:N/C:N/I:N/A:C
7.1VulDB CNACVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5VulDB CNACVSS:3.0/AV:A/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 exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo