Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows…
Priority MEDIUM 47CWE-120Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/"portMappingIndex "request. This occurs because the "formDelPortMapping" function directly passes the parameter "portMappingIndex" to strcpy without limit.
Why it matters now
EPSS 0.02828 86th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:tenda:g1_firmware:v15.11.0.17\(9502\)_cn:*:*:*:*:*:*:* | v15.11.0.17(9502)_cn | Vulnerable | Tenda |
| cpe:2.3:h:tenda:g1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Tenda |
| cpe:2.3:o:tenda:g3_firmware:v15.11.0.17\(9502\)_cn:*:*:*:*:*:*:* | v15.11.0.17(9502)_cn | Vulnerable | Tenda |
| cpe:2.3:h:tenda:g3:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Tenda |
- cpe:2.3:o:tenda:g1_firmware:v15.11.0.17\(9502\)_cn:*:*:*:*:*:*:* Versions v15.11.0.17(9502)_cn Vulnerable ·Tenda
- cpe:2.3:h:tenda:g1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Tenda
- cpe:2.3:o:tenda:g3_firmware:v15.11.0.17\(9502\)_cn:*:*:*:*:*:*:* Versions v15.11.0.17(9502)_cn Vulnerable ·Tenda
- cpe:2.3:h:tenda:g3:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Tenda
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27707
- 2026-10-03 Alias added: GHSA-j3c8-7g58-h47h
References
More Tenda G1 Firmware vulnerabilities
- TI-2025-43136 Tenda G1V3.1si V16.01.7.8 Firmware V16.01.7.8 was discovered to contain a hardcoded… CVSS 3.1HIGH 8.4
- TI-2025-08227 Tenda G1 Firmware Update check_upload_file data authenticity CVSS 4.0HIGH 7.5
- TI-2021-09135 Buffer Overflow in Tenda G1 and G3 routers with firmware version V15.11.0.17(9502)_CN… CVSS 3.1CRITICAL 9.8
- TI-2021-09134 Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-27707 · CVE Program
- CVE-2021-27707 · NVD
- FIRST EPSS
- GHSA-j3c8-7g58-h47h · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences