How severe is CVE-2026-2909?

CVE-2026-2909 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-2909 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2909?

CVE-2026-2909 affects Tenda Hg9 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-2909?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-2909 have an EU (EUVD) identifier?

Yes. CVE-2026-2909 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7541.

When was CVE-2026-2909 published?

CVE-2026-2909 was published on 2026-02-22 and last updated on 2026-06-17.

CVE-2026-2909

CVE-2026-2909 is a high-severity vulnerability in Tenda Hg9 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7541
Weakness: CWE-119
Affected product: Tenda Hg9 Firmware
Published: 2026-02-22
Last modified: 2026-06-17

Description

A vulnerability was detected in Tenda HG9 300001138. This affects an unknown part of the file /boaform/formPing of the component Diagnostic Ping Endpoint. Performing a manipulation of the argument pingAddr results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.

Frequently asked questions

What is CVE-2026-2909?: A vulnerability was detected in Tenda HG9 300001138. This affects an unknown part of the file /boaform/formPing of the component Diagnostic Ping Endpoint. Performing a manipulation of the argument pingAddr results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.
How severe is CVE-2026-2909?: CVE-2026-2909 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-2909 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2909?: CVE-2026-2909 affects Tenda Hg9 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-2909?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-2909 have an EU (EUVD) identifier?: Yes. CVE-2026-2909 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7541.
When was CVE-2026-2909 published?: CVE-2026-2909 was published on 2026-02-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:hg9_firmware:300001138:*:*:*:*:*:*:*

More vulnerabilities in Tenda Hg9 Firmware

CVE-2026-2910 — High (CVSS 8.8): A flaw has been found in Tenda HG9 300001138. This vulnerability affects unknown code of the file /boaform/formPing6.…
CVE-2026-2908 — High (CVSS 8.8): A security vulnerability has been detected in Tenda HG9 300001138. Affected by this issue is some unknown functionality…
CVE-2026-2907 — High (CVSS 8.8): A weakness has been identified in Tenda HG9 300001138. Affected by this vulnerability is an unknown functionality of…
CVE-2026-2906 — High (CVSS 8.8): A security flaw has been discovered in Tenda HG9 300001138. Affected is an unknown function of the file…
CVE-2026-2905 — High (CVSS 8.8): A vulnerability was identified in Tenda HG9 300001138. This impacts an unknown function of the file…
CVE-2022-30023 — High (CVSS 8.8): Tenda ONT GPON AC1200 Dual band WiFi HG9 v1.0.1 is vulnerable to Command Injection via the Ping function.

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