dbcve.org
Ac6 FirmwareOperating system · Tenda

CVE-2023-40848

CRITICAL · 9.8 CVSS v3.1 Published 2023-08-30
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
Tenda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin is vulnerable to Buffer Overflow via the function "sub_7D858."

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 confidence

Buffer overflow vulnerability in Tenda AC6 router firmware (US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin) within function sub_7D858 allows remote, unauthenticated attackers to execute arbitrary code due to improper bounds checking. The CVSS 9.8 indicates network-level exploitation with no authentication required.

MitigationApply vendor firmware update if available; otherwise replace the device with a supported model or implement network segmentation to restrict access to the router's management interface.

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
Ac6 FirmwareOperating system
Affected:= 15.03.05.16

CVSS 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
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the router model
    Access the router web interface or CLI and check the device model name. This is typically found in the status page, system info, or on the device label.
    Affected if The device is a Tenda AC6 router
  2. Check the installed firmware version
    Log into the router web interface and navigate to System Settings > Firmware Upgrade or System Status to view the current firmware version. Alternatively, use the CLI command 'cat /proc/version' or check the firmware file name if accessible.
    Affected if The firmware version is 15.03.05.16 (US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin)
  3. Verify network exposure of management interface
    Check if the router web interface (HTTP/HTTPS on port 80/443) is accessible from the WAN/internet. Use an external scanner or check port forwarding/NAT rules on the upstream device.
    Affected if The router management interface is exposed to the internet or untrusted networks

You are affected if you have a Tenda AC6 router running firmware version 15.03.05.16 with its management interface accessible from the network.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor firmware update if available; otherwise replace the device with a supported model or implement network segmentation to restrict access to the router's management interface.

Fix this in Ac6 Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-40848 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data