CVE-2022-21201Public exploit

Code execution via unbounded serial-number formatting

Published Aug 5, 2022 · Updated Apr 15, 2025

Stack-based buffer overflow in TCL LINKHUB Mesh Wi-Fi AC1200 MS1G_00_01.00_14 allows remote attackers to execute code via a crafted packet. The ucloud_add_node_new handler passes the packet-controlled ManualNodeInfo serialNumMd5 string to sprintf without a length limit, overflowing a 128-byte stack buffer. Reachability requires access to port 9003 on the router-provided Wi-Fi; a 140-byte value overwrites the MIPS return address, enabling code execution or a crash.

CVSS severity8.8
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in TCL LINKHUB Mesh Wi-Fi AC1200 MS1G_00_01.00_14 allows remote attackers to execute code via a crafted packet. The ucloud_add_node_new handler passes the packet-controlled ManualNodeInfo serialNumMd5 string to sprintf without a length limit, overflowing a 128-byte stack buffer. Reachability requires access to port 9003 on the router-provided Wi-Fi; a 140-byte value overwrites the MIPS return address, enabling code execution or a crash.

The record

CVE
CVE-2022-21201
Published
Aug 5, 2022
Updated
Apr 15, 2025
Vendor
TCL
Product
TCL LINKHUB Mesh Wi-Fi AC1200
Classifications
CWE-787, CWE-121, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record 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=MS1G_00_01.00_14

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TCL · TCL LINKHUB Mesh Wi-Fi AC1200version=MS1G_00_01.00_14

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8Cisco TalosCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1210Exploitation of Remote Services

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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