Unrecoverable service interruption via unchecked sys.vendor field
Published Sep 23, 2025 · Updated Sep 23, 2025
Stack buffer overflow in Tenda AC9 firmware 1.0 allows remote attackers to cause an unrecoverable service interruption via a configuration file. The GetValue("sys.vendor", src) path reads an overlong sys.vendor field from the uploaded configuration into a stack destination without a length check. Exploitation requires the ability to alter and upload the router configuration; the reported consequence is permanent denial of service, not code execution.
Summary
What happened
Stack buffer overflow in Tenda AC9 firmware 1.0 allows remote attackers to cause an unrecoverable service interruption via a configuration file. The GetValue("sys.vendor", src) path reads an overlong sys.vendor field from the uploaded configuration into a stack destination without a length check. Exploitation requires the ability to alter and upload the router configuration; the reported consequence is permanent denial of service, not code execution.
The record
- CVE
- CVE-2025-57638
- Published
- Sep 23, 2025
- Updated
- Sep 23, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-122, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 23, 2025CVE publishedPublication date reported by the CVE source.
- Sep 23, 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.
Public exploit references
- Malicious AC9 configuration-file demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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