Memory corruption via crafted update filename
Published May 10, 2025 · Updated May 12, 2025
Buffer overflow in TOTOLINK router firmware 4.1.8cu.5241_B20210927 allows remote authenticated users to corrupt process memory. The CloudACMunualUpdate function in /cgi-bin/cstecgi.cgi mishandles attacker-controlled FileName data and writes beyond a memory buffer. Low-privileged access to the network management interface is required; the public record does not identify whether exploitation yields code execution or only a crash.
Summary
What happened
Buffer overflow in TOTOLINK router firmware 4.1.8cu.5241_B20210927 allows remote authenticated users to corrupt process memory. The CloudACMunualUpdate function in /cgi-bin/cstecgi.cgi mishandles attacker-controlled FileName data and writes beyond a memory buffer. Low-privileged access to the network management interface is required; the public record does not identify whether exploitation yields code execution or only a crash.
The record
- CVE
- CVE-2025-4496
- Published
- May 10, 2025
- Updated
- May 12, 2025
- Vendor
- TOTOLINK
- Product
- A810R
- Classifications
- CWE-119, CWE-120, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 10, 2025CVE publishedPublication date reported by the CVE source.
- May 12, 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=4.1.8cu.5241_B20210927
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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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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