Code execution via unchecked subnet copy
Published Jun 22, 2025 · Updated Jun 23, 2025
Stack-based buffer overflow in TOTOLINK A3002R 1.1.1-B20200824.0128 allows remote authenticated users to execute code via subnet input. The boa formRoute handler copies the attacker-controlled subnet parameter into a local stack buffer without checking its length, overwriting the function return address. Access to the route-management interface is required; exploitation can execute arbitrary code or crash the router and persistently interrupt service.
Summary
What happened
Stack-based buffer overflow in TOTOLINK A3002R 1.1.1-B20200824.0128 allows remote authenticated users to execute code via subnet input. The boa formRoute handler copies the attacker-controlled subnet parameter into a local stack buffer without checking its length, overwriting the function return address. Access to the route-management interface is required; exploitation can execute arbitrary code or crash the router and persistently interrupt service.
The record
- CVE
- CVE-2025-6487
- Published
- Jun 22, 2025
- Updated
- Jun 23, 2025
- Vendor
- TOTOLINK
- Product
- A3002R
- Classifications
- CWE-119, CWE-121, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 22, 2025CVE publishedPublication date reported by the CVE source.
- Jun 23, 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.
- Affected versionversion=1.1.1-B20200824.0128
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- TOTOLINK A3002R formRoute oversized-subnet proof of conceptproof of concept · demonstrated
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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