CVE-2023-51147Public exploit

Authenticated code execution via unchecked username formatting

Published Mar 26, 2024 · Updated Aug 5, 2024

Stack-based buffer overflow in TRENDnet TEW-821DAP firmware 3.00b06 allows remote authenticated users to execute arbitrary code. The ssi CGI passes an HTTP username of up to 256 characters to sprintf for a grep command in a 64-byte stack buffer without a length check. Adjacent-network access and a valid session token are required; a 256-character username corrupts the stack and can crash the CGI or alter control flow.

CVSS severity8.0
High
EPSS probability0.50%
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 TRENDnet TEW-821DAP firmware 3.00b06 allows remote authenticated users to execute arbitrary code. The ssi CGI passes an HTTP username of up to 256 characters to sprintf for a grep command in a 64-byte stack buffer without a length check. Adjacent-network access and a valid session token are required; a 256-character username corrupts the stack and can crash the CGI or alter control flow.

The record

CVE
CVE-2023-51147
Published
Mar 26, 2024
Updated
Aug 5, 2024
Vendor
TRENDnet
Product
TEW-821DAP
Classifications
CWE-121, T1210
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=3.00b6

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

TRENDnet · TEW-821DAPversion=3.00b6

Published CVSS scores

8.0CISA-ADPCVSS:3.1/AV:A/AC:L/PR:L/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.

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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)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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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