How severe is CVE-2026-36738?

CVE-2026-36738 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-36738 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-36738?

CVE-2026-36738 affects U-speed T18-21k Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-36738?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-36738 have an EU (EUVD) identifier?

Yes. CVE-2026-36738 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30043.

When was CVE-2026-36738 published?

CVE-2026-36738 was published on 2026-05-13 and last updated on 2026-06-30.

CVE-2026-36738

CVE-2026-36738 is a medium-severity vulnerability in U-speed T18-21k Firmware with a CVSS 3.x base score of 6.8. 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-284.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30043
Weakness: CWE-284
Affected product: U-speed T18-21k Firmware
Published: 2026-05-13
Last modified: 2026-06-30

Description

U-SPEED AC1200 Gigabit Wi-Fi Router (Model: T18-21K) V1.0 is vulnerable to Incorrect Access Control. The device exposes a UART interface that lacks authentication, authorization, or access control mechanisms. An attacker with physical access to the UART pins can connect to the interface and gain unrestricted access to device functionality.

Frequently asked questions

What is CVE-2026-36738?: U-SPEED AC1200 Gigabit Wi-Fi Router (Model: T18-21K) V1.0 is vulnerable to Incorrect Access Control. The device exposes a UART interface that lacks authentication, authorization, or access control mechanisms. An attacker with physical access to the UART pins can connect to the interface and gain unrestricted access to device functionality.
How severe is CVE-2026-36738?: CVE-2026-36738 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-36738 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-36738?: CVE-2026-36738 affects U-speed T18-21k Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-36738?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-36738 have an EU (EUVD) identifier?: Yes. CVE-2026-36738 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30043.
When was CVE-2026-36738 published?: CVE-2026-36738 was published on 2026-05-13 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:o:u-speed:t18-21k_firmware:1.0:*:*:*:*:*:*:*

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