What is the CVSS score of CVE-2026-2908?

CVE-2026-2908 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Hg9 Firmware are affected by CVE-2026-2908?

A high-severity vulnerability (CVE-2026-2908) affecting Tenda HG9 devices has been publicly disclosed with working exploits available, but no patch currently exists from the vendor.

Is there a public PoC exploit available for CVE-2026-2908?

Yes, a public proof-of-concept exploit is available for CVE-2026-2908. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2908?

Within 24 hours: Identify and inventory all Tenda HG9 devices (model 300001138) in production and isolate them from untrusted networks if possible. Within 7 days: Implement network segmentation to restrict access to the /boaform/formLoopBack endpoint and deploy WAF rules to block malicious requests. Within 30 days: Develop a device replacement plan with Tenda or alternative vendors and begin procurement of patched hardware.

Hg9 Firmware CVE-2026-2908

HIGH

Buffer Overflow (CWE-119)

2026-02-22 cna@vuldb.com

Buffer Overflow Stack Overflow Hg9 Firmware

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

PoC Detected

Feb 23, 2026 - 20:21 vuln.today

Public exploit code

CVE Published

Feb 22, 2026 - 02:16 nvd

HIGH 8.8

DescriptionCVE.org

A security vulnerability has been detected in Tenda HG9 300001138. Affected by this issue is some unknown functionality of the file /boaform/formLoopBack of the component Loopback Detection Configuration Endpoint. Such manipulation of the argument Ethtype leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used.

AnalysisAI

Stack-based buffer overflow in Tenda HG9 firmware's loopback detection endpoint allows remote attackers with valid credentials to achieve complete system compromise through manipulation of the Ethtype parameter. Public exploit code exists for this vulnerability, creating immediate risk in deployed environments. No patch is currently available.

Technical ContextAI

Classified as CWE-119 (Buffer Overflow). Affects Hg9 Firmware. A security vulnerability has been detected in Tenda HG9 300001138. Affected by this issue is some unknown functionality of the file /boaform/formLoopBack of the component Loopback Detection Configuration Endpoint. Such manipulation of the argument Ethtype leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used.

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.