CVE-2025-9605Public exploitNetwork attack vector

Router crash via unchecked mac parameter

Published Aug 29, 2025 · Updated Aug 29, 2025

Stack-based buffer overflow in Tenda AC21 and AC23 16.03.08.16 allows remote attackers to crash the router via a crafted mac parameter. GetParentControlInfo passes the unauthenticated mac query value to strcpy, which copies it into a 602-byte region without checking its length. Reaching the web management endpoint requires network access; the published proof of concept sends a 512,000-byte value repeatedly to interrupt service.

CVSS severity9.8
Critical
EPSS probability5.04%
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 Tenda AC21 and AC23 16.03.08.16 allows remote attackers to crash the router via a crafted mac parameter. GetParentControlInfo passes the unauthenticated mac query value to strcpy, which copies it into a 602-byte region without checking its length. Reaching the web management endpoint requires network access; the published proof of concept sends a 512,000-byte value repeatedly to interrupt service.

The record

CVE
CVE-2025-9605
Published
Aug 29, 2025
Updated
Aug 29, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC21 Firmware
Classifications
CWE-121, CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 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=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
Shenzhen Tenda Technology Co., Ltd. · AC23version=16.03.08.16

Published CVSS scores

10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based 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

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Your stack

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