Authenticated code execution via sysreboot buffer overflow
Published Aug 24, 2026 · Updated Aug 24, 2026
Buffer overflow in DrayTek VigorSwitch firmware allows remote authenticated users to crash appliances or execute arbitrary code. The sysreboot function unsafely concatenates split valueN data into a fixed-size buffer without enforcing total length. Access requires valid administrative credentials for the web management interface; DrayTek reports no known trigger or practical attack path.
Summary
What happened
Buffer overflow in DrayTek VigorSwitch firmware allows remote authenticated users to crash appliances or execute arbitrary code. The sysreboot function unsafely concatenates split valueN data into a fixed-size buffer without enforcing total length. Access requires valid administrative credentials for the web management interface; DrayTek reports no known trigger or practical attack path.
The record
- CVE
- CVE-2026-71936
- Published
- Aug 24, 2026
- Updated
- Aug 24, 2026
- Vendor
- DrayTek
- Product
- VigorSwitch P2100
- Classifications
- CWE-120
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Aug 24, 2026CVE publishedPublication date reported by the CVE source.
- Aug 24, 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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- Affected versionversion=0 <2.9.10
What conditions does exploitation require?
What is affected?
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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