Authenticated memory corruption via unchecked sprintf copy
Published Mar 26, 2026 · Updated Mar 26, 2026
Stack-based buffer overflow in Tenda AC5 15.03.06.47 allows remote authenticated users to corrupt memory via a crafted page parameter. The fromAddressNat handler passes the POST page value through sprintf into a fixed-size stack buffer without a length check, allowing the copy to overwrite its return address. Low-privileged access to the management endpoint is required; the published proof of concept demonstrates the trigger, but not arbitrary code execution.
Summary
What happened
Stack-based buffer overflow in Tenda AC5 15.03.06.47 allows remote authenticated users to corrupt memory via a crafted page parameter. The fromAddressNat handler passes the POST page value through sprintf into a fixed-size stack buffer without a length check, allowing the copy to overwrite its return address. Low-privileged access to the management endpoint is required; the published proof of concept demonstrates the trigger, but not arbitrary code execution.
The record
- CVE
- CVE-2026-4902
- Published
- Mar 26, 2026
- Updated
- Mar 26, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- AC5
- Classifications
- CWE-121, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 26, 2026CVE publishedPublication date reported by the CVE source.
- Mar 26, 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=15.03.06.47
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
- Tenda AC5 addressNat page proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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