CVE-2025-6393Public exploitNetwork attack vector

Authenticated denial of service via oversized submit-url

Published Jun 21, 2025 · Updated Jun 23, 2025

Buffer overflow in TOTOLINK A702R, A3002R, A3002RU, and EX1200T firmware allows remote authenticated users to crash the device. The /boafrm/formIPv6Addr HTTP POST handler copies an oversized submit-url value without validating its length, overflowing a memory buffer. A valid management session is required, and a crafted request can interrupt routing or range-extender service on an affected build.

CVSS severity8.8
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer overflow in TOTOLINK A702R, A3002R, A3002RU, and EX1200T firmware allows remote authenticated users to crash the device. The /boafrm/formIPv6Addr HTTP POST handler copies an oversized submit-url value without validating its length, overflowing a memory buffer. A valid management session is required, and a crafted request can interrupt routing or range-extender service on an affected build.

The record

CVE
CVE-2025-6393
Published
Jun 21, 2025
Updated
Jun 23, 2025
Vendor
TOTOLINK
Product
A702R
Classifications
CWE-119, CWE-120, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.0-B20230809.1615
  2. Affected versionversion=4.0.0-B20230531.1404
  3. Affected versionversion=4.0.0-B20230721.1521
  4. Affected versionversion=4.1.2cu.5232_B20210713

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A702Rversion=3.0.0-B20230809.1615; version=4.0.0-B20230531.1404; version=4.0.0-B20230721.1521; version=4.1.2cu.5232_B20210713
TOTOLINK · A3002Rversion=3.0.0-B20230809.1615; version=4.0.0-B20230531.1404; version=4.0.0-B20230721.1521; version=4.1.2cu.5232_B20210713
TOTOLINK · EX1200Tversion=3.0.0-B20230809.1615; version=4.0.0-B20230531.1404; version=4.0.0-B20230721.1521; version=4.1.2cu.5232_B20210713
TOTOLINK · A3002RUversion=3.0.0-B20230809.1615; version=4.0.0-B20230531.1404; version=4.0.0-B20230721.1521; version=4.1.2cu.5232_B20210713

Published CVSS scores

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
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
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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')
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo