Device crash via unchecked pingtrace concatenation
Published Aug 24, 2026 · Updated Aug 24, 2026
Buffer overflow in DrayTek VigorSwitch firmware allows remote authenticated users to crash an appliance through crafted pingtrace fields. The mainfunction.cgi pingtrace handler concatenates host, count, and interval values into a fixed-size buffer without length checks. Administrative web-interface credentials are required; DrayTek confirms the code condition but reports no known trigger or demonstrated attack path.
Summary
What happened
Buffer overflow in DrayTek VigorSwitch firmware allows remote authenticated users to crash an appliance through crafted pingtrace fields. The mainfunction.cgi pingtrace handler concatenates host, count, and interval values into a fixed-size buffer without length checks. Administrative web-interface credentials are required; DrayTek confirms the code condition but reports no known trigger or demonstrated attack path.
The record
- CVE
- CVE-2026-71934
- Published
- Aug 24, 2026
- Updated
- Aug 24, 2026
- Vendor
- DrayTek
- Product
- VigorSwitch P2100
- Classifications
- CWE-120, T1499.004
- 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- 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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo