Unauthenticated code execution via unbounded serviceName copy
Published Dec 17, 2025 · Updated Dec 17, 2025
Buffer overflow in Tenda AC10 V4.0 firmware 16.03.10.20 allows remote attackers to crash the router or execute code via an HTTP POST. The fromAdvSetMacMtuWan handler passes the untrusted serviceName field from /goform/AdvSetMacMtuWan to strcpy, which writes into a fixed destination at offset 98 without checking its length. No authentication or user interaction is required, but the attacker must reach the router's HTTP management interface; the overwrite can terminate httpd or execute code in its process context.
Summary
What happened
Buffer overflow in Tenda AC10 V4.0 firmware 16.03.10.20 allows remote attackers to crash the router or execute code via an HTTP POST. The fromAdvSetMacMtuWan handler passes the untrusted serviceName field from /goform/AdvSetMacMtuWan to strcpy, which writes into a fixed destination at offset 98 without checking its length. No authentication or user interaction is required, but the attacker must reach the router's HTTP management interface; the overwrite can terminate httpd or execute code in its process context.
The record
- CVE
- CVE-2025-67073
- Published
- Dec 17, 2025
- Updated
- Dec 17, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 17, 2025CVE publishedPublication date reported by the CVE source.
- Dec 17, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
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
- CVE-2025-67073 HTTP POST proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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