CVE-2025-14655Public exploitNetwork attack vector

Command execution via undersized rebootTime stack buffer

Published Dec 14, 2025 · Updated Dec 14, 2025

Stack-based buffer overflow in Tenda AC20 16.03.08.12 allows remote authenticated users to execute commands or crash httpd. The formSetRebootTimer handler passes an unrestricted rebootTime value to sub_497114, where sprintf writes two up-to-10-digit integers into an eight-byte stack buffer. Access to the router's web management interface is required; a crafted POST to /goform/SetSysAutoRebbotCfg can terminate the service, while the published analysis also reports arbitrary command execution.

CVSS severity8.8
High
EPSS probability3.33%
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 AC20 16.03.08.12 allows remote authenticated users to execute commands or crash httpd. The formSetRebootTimer handler passes an unrestricted rebootTime value to sub_497114, where sprintf writes two up-to-10-digit integers into an eight-byte stack buffer. Access to the router's web management interface is required; a crafted POST to /goform/SetSysAutoRebbotCfg can terminate the service, while the published analysis also reports arbitrary command execution.

The record

CVE
CVE-2025-14655
Published
Dec 14, 2025
Updated
Dec 14, 2025
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC20
Classifications
CWE-121, CWE-119, CWE-787, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 14, 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=16.03.08.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC20version=16.03.08.12

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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