CVE-2026-5349: Trendnet Tew-657brm Firmware buffer overflow (CVSS 8.8)

Description

A vulnerability was identified in Trendnet TEW-657BRM 1.00.1. The affected element is the function add_apcdb of the file /setup.cgi. The manipulation of the argument mac_pc_dba leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit is publicly available and might 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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Trendnet Tew-657brm Firmware1.00.1

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

https://github.com/panda666-888/vuls/blob/main/trendnet/tew-657brm/add_apcdb.mdExploitThird Party Advisory
https://vuldb.com/submit/781563Third Party AdvisoryVDB Entry
https://vuldb.com/vuln/354702Third Party AdvisoryVDB Entry
https://vuldb.com/vuln/354702/ctiPermissions RequiredVDB Entry

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-5349 being actively exploited?

CVE-2026-5349 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.01%.

How severe is CVE-2026-5349?

CVE-2026-5349 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 1.01% probability of exploitation.

Which products are affected by CVE-2026-5349?

Affected products include Trendnet Tew-657brm Firmware.

How do I fix CVE-2026-5349?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-5349 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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