There is a buffer overflow vulnerability in the Web server httpd of the router in Tenda…
Priority LOW 30CWE-119Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
There is a buffer overflow vulnerability in the Web server httpd of the router in Tenda router devices such as Tenda AC9 V1.0 V15.03.02.19(6318) and Tenda AC9 V3.0 V15.03.06.42_multi. When setting the virtual service, the httpd program will crash and exit when the super-long list parameter occurs.
Why it matters now
EPSS 0.00819 57th 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:ac9_firmware:15.03.05.19\(6318\):*:*:*:*:*:*:* | 15.03.05.19(6318) | Vulnerable | Tenda |
| cpe:2.3:h:tenda:ac9:1.0:*:*:*:*:*:*:* | 1.0 | Running on | Tenda |
| cpe:2.3:o:tenda:ac9_firmware:15.03.06.42_multi:*:*:*:*:*:*:* | 15.03.06.42_multi | Vulnerable | Tenda |
| cpe:2.3:h:tenda:ac9:3.0:*:*:*:*:*:*:* | 3.0 | Running on | Tenda |
- cpe:2.3:o:tenda:ac9_firmware:15.03.05.19\(6318\):*:*:*:*:*:*:* Versions 15.03.05.19(6318) Vulnerable ·Tenda
- cpe:2.3:h:tenda:ac9:1.0:*:*:*:*:*:*:* Versions 1.0 Running on ·Tenda
- cpe:2.3:o:tenda:ac9_firmware:15.03.06.42_multi:*:*:*:*:*:*:* Versions 15.03.06.42_multi Vulnerable ·Tenda
- cpe:2.3:h:tenda:ac9:3.0:*:*:*:*:*:*:* Versions 3.0 Running on ·Tenda
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-42659
- 2026-10-03 Alias added: GHSA-mf8h-g57h-xqhr
References
More Tenda Ac9 Firmware vulnerabilities
- TI-2018-10434 An issue was discovered on Tenda AC7 devices with firmware through V15.03.06.44_CN(AC7)… KEVCVSS 3.1CRITICAL 9.8
- TI-2025-28777 In the Tenda ac9 v1.0 router with firmware V15.03.05.14_multi, there is a stack overflow… CVSS 3.1CRITICAL 9.8
- TI-2025-28776 In Tenda ac9 v1.0 with firmware V15.03.05.14_multi, the rebootTime parameter of… CVSS 3.1CRITICAL 9.8
- TI-2025-28775 In Tenda AC9 v1.0 with firmware V15.03.05.14_multi, the security parameter of… CVSS 3.1CRITICAL 9.8
- TI-2025-28726 Tenda AC9 v15.03.05.14 was discovered to contain a command injection vulnerability via the Telnet function. CVSS 3.1CRITICAL 9.8
- TI-2025-28675 Tenda AC9 V15.03.06.42_multi was found to contain a command injection vulnerability in… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-42659 · CVE Program
- CVE-2021-42659 · NVD
- FIRST EPSS
- GHSA-mf8h-g57h-xqhr · GitHub Advisory Database · CC BY 4.0
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