How severe is CVE-2026-5355?

CVE-2026-5355 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-5355 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5355?

CVE-2026-5355 affects Trendnet Tew-657brm Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5355?

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

Does CVE-2026-5355 have an EU (EUVD) identifier?

Yes. CVE-2026-5355 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18412.

When was CVE-2026-5355 published?

CVE-2026-5355 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-5355

CVE-2026-5355 is a medium-severity vulnerability in Trendnet Tew-657brm Firmware with a CVSS 3.x base score of 6.3. 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-77.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 2.1
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18412
Weakness: CWE-77
Affected product: Trendnet Tew-657brm Firmware
Published: 2026-04-02
Last modified: 2026-06-17

Description

A vulnerability has been found in Trendnet TEW-657BRM 1.00.1. Affected by this issue is the function vpn_drop of the file /setup.cgi. The manipulation of the argument policy_name leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The vendor confirms, that "[t]he product in question (...) has been discontinued and end of life since June 23, 2011, that is more than 14 years ago. We no longer provide support for this product, so we are not able to confirm the vulnerabilities. We will make an announcement on our website's product support page and notify customers who registered their products with us." This vulnerability only affects products that are no longer supported by the maintainer.

Frequently asked questions

What is CVE-2026-5355?: A vulnerability has been found in Trendnet TEW-657BRM 1.00.1. Affected by this issue is the function vpn_drop of the file /setup.cgi. The manipulation of the argument policy_name leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The vendor confirms, that "[t]he product in question (...) has been discontinued and end of life since June 23, 2011, that is more than 14 years ago. We no longer provide support for this product, so we are not able to confirm the vulnerabilities. We will make an announcement on our website's product support page and notify customers who registered their products with us." This vulnerability only affects products that are no longer supported by the maintainer.
How severe is CVE-2026-5355?: CVE-2026-5355 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-5355 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5355?: CVE-2026-5355 affects Trendnet Tew-657brm Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5355?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5355 have an EU (EUVD) identifier?: Yes. CVE-2026-5355 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18412.
When was CVE-2026-5355 published?: CVE-2026-5355 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:trendnet:tew-657brm_firmware:1.00.1:*:*:*:*:*:*:*

More vulnerabilities in Trendnet Tew-657brm Firmware

CVE-2026-5350 — High (CVSS 8.8): A security flaw has been discovered in Trendnet TEW-657BRM 1.00.1. The impacted element is the function update_pcdb of…
CVE-2026-5349 — High (CVSS 8.8): A vulnerability was identified in Trendnet TEW-657BRM 1.00.1. The affected element is the function add_apcdb of the…
CVE-2025-65202 — High (CVSS 8.0): TRENDnet TEW-657BRM 1.00.1 has an authenticated remote OS command injection vulnerability in the setup.cgi binary,…
CVE-2026-5354 — Medium (CVSS 6.3): A flaw has been found in Trendnet TEW-657BRM 1.00.1. Affected by this vulnerability is the function vpn_connect of the…
CVE-2026-5353 — Medium (CVSS 6.3): A vulnerability was detected in Trendnet TEW-657BRM 1.00.1. Affected is the function ping_test of the file /setup.cgi.…
CVE-2026-5352 — Medium (CVSS 6.3): A security vulnerability has been detected in Trendnet TEW-657BRM 1.00.1. This impacts the function Edit of the file…

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