How severe is CVE-2026-3400?

CVE-2026-3400 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-2026-3400 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3400?

CVE-2026-3400 affects Tenda Ac15 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3400?

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-2026-3400 have an EU (EUVD) identifier?

Yes. CVE-2026-3400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9133.

When was CVE-2026-3400 published?

CVE-2026-3400 was published on 2026-03-02 and last updated on 2026-06-17.

CVE-2026-3400

CVE-2026-3400 is a high-severity vulnerability in Tenda Ac15 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9133
Weakness: CWE-787
Affected product: Tenda Ac15 Firmware
Published: 2026-03-02
Last modified: 2026-06-17

Description

A security flaw has been discovered in Tenda AC15 up to 15.13.07.13. Affected by this issue is some unknown functionality of the file /goform/TextEditingConversion. The manipulation of the argument wpapsk_crypto2_4g results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.

Frequently asked questions

What is CVE-2026-3400?: A security flaw has been discovered in Tenda AC15 up to 15.13.07.13. Affected by this issue is some unknown functionality of the file /goform/TextEditingConversion. The manipulation of the argument wpapsk_crypto2_4g results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.
How severe is CVE-2026-3400?: CVE-2026-3400 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-2026-3400 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3400?: CVE-2026-3400 affects Tenda Ac15 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3400?: 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-2026-3400 have an EU (EUVD) identifier?: Yes. CVE-2026-3400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9133.
When was CVE-2026-3400 published?: CVE-2026-3400 was published on 2026-03-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:ac15_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Tenda Ac15 Firmware

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CVE-2025-25632 — Critical (CVSS 9.8): Tenda AC15 v15.03.05.19 is vulnerable to Command Injection via the handler function in /goform/telnet.

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