CVE-2026-0640Public exploitNetwork attack vector

Remote code execution via unbounded sscanf parsing

Published Jan 6, 2026 · Updated Jan 6, 2026

Buffer overflow in Tenda AC23 16.03.07.52 allows remote attackers to execute arbitrary code via a crafted PowerSaveSet request. PowerSaveSet passes the attacker-controlled time field to sscanf conversion directives that lack width limits, overflowing fixed-size destination buffers. The request must reach the router management interface; successful exploitation can execute code or crash the device.

CVSS severity9.8
Critical
EPSS probability3.43%
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 AC23 16.03.07.52 allows remote attackers to execute arbitrary code via a crafted PowerSaveSet request. PowerSaveSet passes the attacker-controlled time field to sscanf conversion directives that lack width limits, overflowing fixed-size destination buffers. The request must reach the router management interface; successful exploitation can execute code or crash the device.

The record

CVE
CVE-2026-0640
Published
Jan 6, 2026
Updated
Jan 6, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC23
Classifications
CWE-120, CWE-119, T1190
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 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=16.03.07.52

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC23version=16.03.07.52

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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