CVE-2026-77945Public exploitNetwork attack vector

Authenticated command execution via unsanitized upload filename

Published Aug 22, 2026 · Updated Aug 25, 2026

Command injection in TRENDnet TEW-821DAP 2.2.01b05 allows remote authenticated users to execute commands via a crafted upload filename. The cgi/ssi upload handler reads filename with getenv(), concatenates it into a shell command, and passes the result to _system() without sanitization. Published CNA metrics require low privileges and no user interaction; successful commands execute in the embedded device context.

CVSS severity7.4
High
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in TRENDnet TEW-821DAP 2.2.01b05 allows remote authenticated users to execute commands via a crafted upload filename. The cgi/ssi upload handler reads filename with getenv(), concatenates it into a shell command, and passes the result to _system() without sanitization. Published CNA metrics require low privileges and no user interaction; successful commands execute in the embedded device context.

The record

CVE
CVE-2026-77945
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
TRENDnet
Product
TEW-821DAP
Classifications
CWE-77, CWE-74, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=2.2.01b05

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TRENDnet · TEW-821DAPversion=2.2.01b05

Published CVSS scores

7.4VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1059.004Command and Scripting Interpreter Unix Shell

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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