TI-2026-01840 Aliases CVE-2026-2191 GHSA-j5pp-jx5r-4q45

Tenda AC9 formGetDdosDefenceList stack-based overflow

HIGH 72CWE-119Published 2026-02-08 · Updated 2026-02-23

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

A weakness has been identified in Tenda AC9 15.03.06.42_multi. Affected is the function formGetDdosDefenceList. This manipulation of the argument security.ddos.map causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00786 56th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Tenda	AC9	15.03.06.42_multi	—	No fix listed	CNA

AC9 VendorTenda Affected 15.03.06.42_multi Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
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:-:::::::*	not specified by NVD	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:-:*:*:*:*:*:*:* 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-2026-2191
2026-10-03 Alias added: GHSA-j5pp-jx5r-4q45

References

Exploit 1

https://github.com/glkfc/IoT-Vulnerability/blob/main/Tenda/tenda3.md

Other 1

https://www.tenda.com.cn/

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

See all 91 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences