Security readout for executives and security teams
Plain-English summary
CVE-2020-13392 is a buffer overflow in the web server of several Tenda AC-series routers. A crafted POST request to the management interface can overwrite stack memory and may allow arbitrary code execution. Business risk is highest where affected router admin interfaces are reachable by untrusted users or exposed to the internet.
Executive priority
Prioritize remediation for internet-facing or shared-network routers because compromise could give an attacker control over network edge equipment. If affected devices are isolated and managed only from trusted networks, urgency is lower but still operationally important.
Technical view
In httpd, processing /goform/setcfm funcpara1 uses attacker-controlled input directly in sprintf into a stack buffer, allowing return address overwrite. Sources name Tenda AC6, AC9, AC15, and AC18 firmware versions. No CVSS score, CWE mapping, or vendor patch details are included in the provided bundle.
Likely exposure
Exposure is limited to the named Tenda AC-series router models and firmware versions, especially systems with the router web management interface reachable from WAN, guest, or untrusted LAN networks.
Exploitation context
The sources describe arbitrary code execution potential, but the bundle does not show CISA KEV listing or active exploitation evidence. Treat public technical disclosure as increasing risk, without claiming observed exploitation.
Researcher notes
Evidence is source-limited. The core issue is stack corruption in Tenda httpd via funcpara1 handling for /goform/setcfm. Provided data does not include reliable patch status, exploit prevalence, authentication requirements, or CVSS metrics.
Mitigation direction
- Check Tenda guidance for fixed firmware or replacement options.
- Restrict router web administration to trusted management networks only.
- Disable WAN-side management if enabled.
- Inventory affected model and firmware versions.
- Replace unsupported affected routers where no vendor fix exists.
Validation and detection
- Identify Tenda AC6, AC9, AC15, and AC18 devices in inventory.
- Compare firmware versions against the named affected versions.
- Verify web management is not internet-accessible.
- Review firewall rules limiting administrative access.
- Confirm remediation through firmware status or replacement records.
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-2020-13392 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-2020-13392-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.