CVE-2026-2147Public exploitNetwork attack vector

Unauthenticated system-log disclosure via missing access checks

Published Feb 8, 2026 · Updated Feb 8, 2026

Improper access control in the Tenda AC21 16.03.08.16 web interface allows remote attackers to read system logs without authentication. The DownloadLog handler omits session and authorization checks, opens the device log, and streams its contents through /cgi-bin/DownloadLog. Any network client that can reach the management interface can retrieve internal addresses, MAC addresses, connection records, and diagnostic data; no configuration change or service interruption is reported.

CVSS severity5.3
Medium
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in the Tenda AC21 16.03.08.16 web interface allows remote attackers to read system logs without authentication. The DownloadLog handler omits session and authorization checks, opens the device log, and streams its contents through /cgi-bin/DownloadLog. Any network client that can reach the management interface can retrieve internal addresses, MAC addresses, connection records, and diagnostic data; no configuration change or service interruption is reported.

The record

CVE
CVE-2026-2147
Published
Feb 8, 2026
Updated
Feb 8, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC21 Firmware
Classifications
CWE-284, CWE-200, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 8, 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=16.03.08.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC21 Firmwareversion=16.03.08.16

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
5.0VulDBAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1005Data from Local System

Public exploit references

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Technologies

Your stack

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Your stack

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