Security readout for executives and security teams
Plain-English summary
CVE-2020-13390 is a memory corruption flaw in the web server of specific Tenda home and small-office routers. A malicious request to the router’s management interface may allow arbitrary code execution. Business urgency depends on whether affected models are still deployed and whether their web administration interface is reachable from untrusted networks.
Executive priority
Treat as high priority for networks still using the affected Tenda routers. The flaw can affect perimeter or branch connectivity devices, but urgency should be driven by confirmed inventory and management-interface exposure.
Technical view
The CVE describes a stack-based buffer overflow in Tenda router httpd handling of POST requests to /goform/addressNat. The entrys and mitInterface parameters are passed into sprintf into a local stack variable, allowing return-address overwrite and possible arbitrary code execution on affected firmware.
Likely exposure
Exposure is limited to the named Tenda AC6, AC9, AC15, and AC18 firmware versions in the CVE description. Risk is materially higher if the router management interface is exposed to the internet, guest networks, or other untrusted LAN segments.
Exploitation context
The source bundle says an attacker can construct a payload for arbitrary code execution. It does not cite active exploitation, and KEV is false, so active exploitation should not be assumed from these sources alone.
Researcher notes
The public record names specific firmware builds and describes the vulnerable code pattern, but the supplied structured affected-product fields are incomplete. No CVSS, CWE, patch status, or exploitation confirmation is provided in the bundle.
Mitigation direction
- Inventory Tenda AC6, AC9, AC15, and AC18 devices and confirm firmware versions.
- Restrict router management access to trusted administrative networks only.
- Disable remote web administration where enabled.
- Check Tenda or device-provider guidance for fixed firmware or replacement advice.
- Replace unsupported affected routers if no vendor fix is available.
Validation and detection
- Compare deployed model and firmware strings against the CVE affected list.
- Confirm the web management interface is not reachable from the internet.
- Review firewall and segmentation rules controlling access to router administration.
- Check device logs for unexpected management-interface access where logging is available.
- Document compensating controls if firmware cannot be updated.
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-2020-13390 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-2020-13390-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.