Security readout for executives and security teams
Plain-English summary
Certain Tenda home and small-office routers have a web server flaw that can let an attacker take control of the device if they can reach the vulnerable management function. The sources do not provide a vendor fix, CVSS score, authentication requirement, or evidence of active exploitation.
Executive priority
Treat this as high priority where affected Tenda routers manage business connectivity or expose administration remotely. The main business risk is loss of network control through device compromise. Urgency is lower only where affected models are absent or management access is tightly isolated.
Technical view
CVE-2020-13389 is a stack-based buffer overflow in Tenda router httpd processing scheduled Wi-Fi time fields. The CVE states user-controlled values are passed to strcpy into a stack local variable, overwriting a return address and enabling arbitrary code execution.
Likely exposure
Exposure is limited to listed Tenda AC6, AC9, AC15, and AC18 firmware versions, especially where the router web management service is reachable from untrusted networks. The source bundle does not identify broader product lines or patched versions.
Exploitation context
The public CVE description and referenced write-up support arbitrary code execution potential. The bundle does not show CISA KEV listing, confirmed in-the-wild exploitation, exploit prevalence, authentication requirements, or internet-wide exposure data.
Researcher notes
The strongest evidence is the CVE description: unsafe strcpy into a stack buffer in httpd while processing scheduled Wi-Fi time parameters. Missing details include authentication boundary, reliable exploitability, patched firmware, and affected CPE mappings, so validation should stay evidence-driven.
Mitigation direction
- Identify and replace or update listed Tenda firmware versions where present.
- Check Tenda support or reseller guidance for fixed firmware or retirement advice.
- Disable remote WAN access to router management interfaces.
- Restrict administrative web access to trusted internal management networks.
- Replace affected devices if no supported firmware fix is available.
Validation and detection
- Inventory Tenda AC6, AC9, AC15, and AC18 routers by model and firmware version.
- Confirm whether router web administration is reachable from WAN or guest networks.
- Review configuration for remote management exposure and unnecessary administrative access.
- Check vendor documentation for firmware newer than the affected versions.
- Prioritize devices in branch offices, unmanaged sites, and ISP-edge locations.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
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 lookupCVE-2020-13389 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://joel-malwarebenchmark.github.io/CVE reference · x_refsource_MISC
- https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13389-Tenda-vulnerability/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.