CVE-2025-6940Public exploitNetwork attack vector

Memory corruption via unchecked submit-url copy

Published Jul 1, 2025 · Updated Jul 1, 2025

Buffer overflow in the A702R HTTP POST handler in TOTOLINK firmware 4.0.0-B20230721.1521 allows remote authenticated users to corrupt memory. The /boafrm/formParentControl handler processes the submit-url argument without enforcing the destination buffer boundary. Successful exploitation corrupts process memory, but public sources do not establish whether this produces a crash or code execution.

CVSS severity8.8
High
EPSS probability0.82%
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 the A702R HTTP POST handler in TOTOLINK firmware 4.0.0-B20230721.1521 allows remote authenticated users to corrupt memory. The /boafrm/formParentControl handler processes the submit-url argument without enforcing the destination buffer boundary. Successful exploitation corrupts process memory, but public sources do not establish whether this produces a crash or code execution.

The record

CVE
CVE-2025-6940
Published
Jul 1, 2025
Updated
Jul 1, 2025
Vendor
TOTOLINK
Product
A702R
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 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=4.0.0-B20230721.1521

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A702Rversion=4.0.0-B20230721.1521

Published CVSS scores

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
9.0VulDBAV:N/AC:L/Au:S/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.

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

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-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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