CVE-2025-10838Public exploitNetwork attack vector

Authenticated service interruption via unchecked strcpy

Published Sep 23, 2025 · Updated Sep 23, 2025

Buffer overflow in Tenda AC21 Firmware 16.03.08.16 allows remote authenticated users to crash the router via WifiExtraSet. The sub_45BB10 handler copies the attacker-controlled wpapsk_crypto value into the fixed-size tkip_aes stack buffer with strcpy and no bounds check. A valid management session and branch-selecting request values are required; the proof of concept demonstrates service interruption, while code execution is reported but not demonstrated.

CVSS severity8.8
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Tenda AC21 Firmware 16.03.08.16 allows remote authenticated users to crash the router via WifiExtraSet. The sub_45BB10 handler copies the attacker-controlled wpapsk_crypto value into the fixed-size tkip_aes stack buffer with strcpy and no bounds check. A valid management session and branch-selecting request values are required; the proof of concept demonstrates service interruption, while code execution is reported but not demonstrated.

The record

CVE
CVE-2025-10838
Published
Sep 23, 2025
Updated
Sep 23, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC21 Firmware
Classifications
CWE-119, CWE-120, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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 privilegesauthenticated

What is affected?

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

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
8.8VulDBCVSS:3.1/AV:N/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.

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120Buffer Copy without Checking Size of Input ('Classic 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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