Service crash via unchecked strncpy copy length
Published Jun 9, 2026 · Updated Jun 9, 2026
Buffer overflow in Tenda W15E 15.11.0.10 allows remote attackers to crash the web service via a crafted HTTP request. The formAddWebAuthUser handler derives a copy length from the first newline in webAuthUserInfo and passes it to strncpy without bounding it to the temp buffer. Network access to the addWebAuthUser CGI action is sufficient; the demonstrated consequence is a process crash or device instability, while the public report does not establish code execution.
Summary
What happened
Buffer overflow in Tenda W15E 15.11.0.10 allows remote attackers to crash the web service via a crafted HTTP request. The formAddWebAuthUser handler derives a copy length from the first newline in webAuthUserInfo and passes it to strncpy without bounding it to the temp buffer. Network access to the addWebAuthUser CGI action is sufficient; the demonstrated consequence is a process crash or device instability, while the public report does not establish code execution.
The record
- CVE
- CVE-2026-36808
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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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
- formAddWebAuthUser denial-of-service proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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