LiveActive security incident?Get immediate response
CVE Record

CVE-2021-31758: An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN.

An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /goform/setportList allows attackers to execute arbitrary code on the system via a crafted post request.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-31758 is a reported code-execution flaw in Tenda AC11 routers running firmware through 02.03.01.104_CN. The issue is a stack buffer overflow in a web management endpoint. If exploitable in a deployed environment, it could let an attacker run code on the device. The sources do not provide CVSS, confirmed exploitation, or a vendor fix.

Executive priority

Treat this as a high-priority network edge risk if affected devices are present. The business urgency depends on exposure of the management interface and whether a vendor-supported update exists. No active exploitation is confirmed in the provided sources.

Technical view

The CVE record describes a stack buffer overflow in /goform/setportList on Tenda AC11 firmware through 02.03.01.104_CN. The reported impact is arbitrary code execution via a crafted POST request. The source bundle does not identify authentication requirements, attack preconditions, CWE, CVSS scoring, or patched firmware details.

Likely exposure

Exposure appears limited to Tenda AC11 devices running firmware through 02.03.01.104_CN, especially where the router web management interface is reachable by untrusted users. The source bundle does not confirm broader Tenda models, regions, or firmware branches.

Exploitation context

The CVE is not listed as CISA KEV in the provided bundle, and no cited source confirms active exploitation. Public vulnerability details exist on GitHub, but the bundle does not establish real-world exploitation, exploit reliability, or required privileges.

Researcher notes

Evidence is thin: affected CPEs are not populated, severity is unknown, and no CVSS or CWE is provided. The core claim is a stack buffer overflow leading to arbitrary code execution on Tenda AC11 firmware through 02.03.01.104_CN. Validate firmware lineage and vendor remediation before broad conclusions.

Mitigation direction

  • Inventory Tenda AC11 devices and record firmware versions.
  • Check Tenda guidance for fixed firmware or replacement advice.
  • Restrict router management access to trusted administrative networks only.
  • Disable external exposure of the management interface where possible.
  • Replace unsupported affected devices if no vendor fix is available.

Validation and detection

  • Confirm whether any Tenda AC11 runs firmware through 02.03.01.104_CN.
  • Verify management interfaces are not reachable from untrusted networks.
  • Review access logs for requests to /goform/setportList.
  • Check vendor firmware release notes for remediation status.
  • Document compensating controls for devices that cannot be updated.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-31758 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.