CVE-2026-19821Public exploitNetwork attack vector

Authenticated memory corruption via rebootTime formatting

Published Aug 14, 2026 · Updated Aug 14, 2026

Buffer overflow in Tenda AC12 15.03.06.23_multi_TD01 allows remote authenticated users to corrupt memory via rebootTime. formSetRebootTimer parses the parameter with sscanf and passes the resulting integers to unbounded sprintf formatting into the 12-byte end_time buffer. Access to the web management interface is required; the published report does not demonstrate a specific post-corruption outcome.

CVSS severity8.8
High
EPSS probability0.47%
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 AC12 15.03.06.23_multi_TD01 allows remote authenticated users to corrupt memory via rebootTime. formSetRebootTimer parses the parameter with sscanf and passes the resulting integers to unbounded sprintf formatting into the 12-byte end_time buffer. Access to the web management interface is required; the published report does not demonstrate a specific post-corruption outcome.

The record

CVE
CVE-2026-19821
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC12
Classifications
CWE-120, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=15.03.06.23_multi_TD01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC12version=15.03.06.23_multi_TD01

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-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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