CVE-2025-9303Public exploitNetwork attack vector

Authenticated code execution via unchecked desc copy

Published Aug 21, 2025 · Updated Aug 21, 2025

Buffer overflow in TOTOLINK A720R 4.1.5cu.630_B20250509 allows remote authenticated users to execute code via a crafted desc value. The setParentalRules handler in /cgi-bin/cstecgi.cgi passes desc to strcpy without checking the destination size. A valid management token and addEffect set to 1 reach the copy; exploitation can crash the router or execute commands.

CVSS severity8.8
High
EPSS probability0.85%
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 TOTOLINK A720R 4.1.5cu.630_B20250509 allows remote authenticated users to execute code via a crafted desc value. The setParentalRules handler in /cgi-bin/cstecgi.cgi passes desc to strcpy without checking the destination size. A valid management token and addEffect set to 1 reach the copy; exploitation can crash the router or execute commands.

The record

CVE
CVE-2025-9303
Published
Aug 21, 2025
Updated
Aug 21, 2025
Vendor
TOTOLINK
Product
A720R
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=4.1.5cu.630_B20250509

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A720Rversion=4.1.5cu.630_B20250509

Published CVSS scores

7.4VulDB CNACVSS: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
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDB CNAAV: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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