CVE-2026-93739Public exploitNetwork attack vector

Authenticated web-service crash via unchecked parameter copy

Published Sep 18, 2026 · Updated Sep 18, 2026

Buffer overflow in TOTOLINK A3002MU Hh-B20211125.1046 allows remote authenticated users to crash its Boa web service. The /boafrm/formWlAc handler copies the user-controlled submit-url value into a fixed-size buffer without enforcing a reliable length boundary. A valid management session is required, and an overlong value overwrites adjacent memory until the embedded web service stops responding.

CVSS severityUnavailable
Unscored
EPSS probability0.85%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in TOTOLINK A3002MU Hh-B20211125.1046 allows remote authenticated users to crash its Boa web service. The /boafrm/formWlAc handler copies the user-controlled submit-url value into a fixed-size buffer without enforcing a reliable length boundary. A valid management session is required, and an overlong value overwrites adjacent memory until the embedded web service stops responding.

The record

CVE
CVE-2026-93739
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
TOTOLINK
Product
A3002MU
Classifications
CWE-119, CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=Hh-B20211125.1046

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A3002MUversion=Hh-B20211125.1046

Published CVSS scores

9.4VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
9.9VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
9.9VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
9.0VulDB CNAAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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')
T1499.004Application or System Exploitation

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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