CVE-2026-86165Public exploitNetwork attack vector

Unauthenticated service interruption via unchecked buffer copy

Published Sep 6, 2026 · Updated Sep 8, 2026

Buffer overflow in Tenda HG10 300001138 allows remote attackers to interrupt service through a crafted formURL HTTP request. The Boa formURL handler copies the user-controlled Keywd value with strcpy into a fixed-size buffer without validating its length, overwriting adjacent memory. Network access to the management HTTP interface is required, with no authentication or user interaction; the demonstrated result is an unresponsive router.

CVSS severity9.8
Critical
EPSS probability0.64%
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 HG10 300001138 allows remote attackers to interrupt service through a crafted formURL HTTP request. The Boa formURL handler copies the user-controlled Keywd value with strcpy into a fixed-size buffer without validating its length, overwriting adjacent memory. Network access to the management HTTP interface is required, with no authentication or user interaction; the demonstrated result is an unresponsive router.

The record

CVE
CVE-2026-86165
Published
Sep 6, 2026
Updated
Sep 8, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
HG10
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=300001138

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · HG10version=300001138

Published CVSS scores

9.3VulDB CNACVSS: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
9.8NVD, using CNA-supplied metricsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NVD, using CNA-supplied metricsAV:N/AC:L/Au:N/C:C/I:C/A:C

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
Privilegesunauthenticated
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')
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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