Authenticated stack corruption via oversized PPPoE password
Published Apr 10, 2026 · Updated Apr 10, 2026
Stack-based buffer overflow in Tenda AC9 15.03.02.13 allows remote authenticated users to corrupt stack memory via a POST request. The formQuickIndex handler passes attacker-controlled PPPOEPassword data to sub_4F7C0, which copies it into a fixed 72-byte stack array without a length check. Low-privilege access to the web interface is required; the published proof of concept submits 1,000 bytes but does not demonstrate code execution.
Summary
What happened
Stack-based buffer overflow in Tenda AC9 15.03.02.13 allows remote authenticated users to corrupt stack memory via a POST request. The formQuickIndex handler passes attacker-controlled PPPOEPassword data to sub_4F7C0, which copies it into a fixed 72-byte stack array without a length check. Low-privilege access to the web interface is required; the published proof of concept submits 1,000 bytes but does not demonstrate code execution.
The record
- CVE
- CVE-2026-6015
- Published
- Apr 10, 2026
- Updated
- Apr 10, 2026
- Vendor
- Shenzhen Tenda Technology Co., Ltd.
- Product
- AC9
- Classifications
- CWE-121, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 10, 2026CVE publishedPublication date reported by the CVE source.
- Apr 10, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=15.03.02.13
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 AC9 QuickIndex proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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