Authenticated device crash via oversized submit-url
Published Jun 10, 2025 · Updated Jun 10, 2025
Buffer overflow in EX1200T 4.1.2cu.5232_B20210713 and earlier allows remote authenticated users to crash the device via HTTP POST. The formReflashClientTbl handler passes an oversized submit-url field to sub_416274 without enforcing the destination buffer size. A valid sessionCheck token is required; the published request demonstrates denial of service but does not demonstrate code execution.
Summary
What happened
Buffer overflow in EX1200T 4.1.2cu.5232_B20210713 and earlier allows remote authenticated users to crash the device via HTTP POST. The formReflashClientTbl handler passes an oversized submit-url field to sub_416274 without enforcing the destination buffer size. A valid sessionCheck token is required; the published request demonstrates denial of service but does not demonstrate code execution.
The record
- CVE
- CVE-2025-5909
- Published
- Jun 10, 2025
- Updated
- Jun 10, 2025
- Vendor
- TOTOLINK
- Product
- EX1200T
- Classifications
- CWE-120, CWE-119, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 10, 2025CVE publishedPublication date reported by the CVE source.
- Jun 10, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.1.2cu.5232_B20210713
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
- formReflashClientTbl oversized submit-url HTTP requestproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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