CVE-2021-45993
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedTenda routers G1 and G3 v15.11.0.17(9502)_CN were discovered to contain a stack overflow in the function formIPMacBindModify. This vulnerability allows attackers to cause a Denial of Service (DoS) via the IPMacBindRuleIP and IPMacBindRuleMac parameters.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA stack buffer overflow vulnerability exists in the formIPMacBindModify function of Tenda G1 and G3 routers running firmware v15.11.0.17(9502)_CN. The vulnerability is triggered via specially crafted IPMacBindRuleIP and IPMacBindRuleMac parameters, allowing remote attackers to cause a Denial of Service by overflowing the stack and crashing the device.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 15.11.0.17\(9502\)_cn= 15.11.0.17\(9502\)_cnCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the router modelLocate the model label on the device or check the router admin interface system status page for the hardware versionAffected if The device is not a Tenda G1 or G3 router (this CVE only affects those models)
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Check the firmware versionAccess the router admin interface and navigate to System Settings or Firmware Upgrade to view the current firmware versionAffected if The firmware version is exactly 15.11.0.17(9502)_CN (only this specific version is listed as affected)
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Verify the IP-MAC binding feature existsLog into the router web interface and look for settings related to IP-MAC binding, usually under Security or Access Control settingsAffected if The formIPMacBindModify function must be present in the firmware for the vulnerability to be exploitable
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Check if remote web management is enabledIn the router admin interface, examine the WAN access or remote management settings (often under System Settings or Advanced)Affected if Remote management (HTTP/HTTPS from WAN) is enabled, as the vulnerability can be triggered remotely via specially crafted parameters
You are affected if you have a Tenda G1 or G3 router running firmware version 15.11.0.17(9502)_CN with the IP-MAC binding feature present and potentially remote management exposed.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply vendor firmware update if available; otherwise, restrict network access to the router's management interface via firewall rules or network segmentation to prevent unauthorized access to the vulnerable function.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-45993 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-45993 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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