CVERadar
CRITICAL · CVSS 4.0 9.3EPSS 0.56% (p47)Threat level 47

CVE-2026-127277: CVE-2026-127277: A security flaw has been discovered in Linksys EA8100 1.0.3.216940. The affected element i…

Unknown · · NVD published 2026-11-13 · posted 2026-11-13 · last modified 2026-11-13

CVE-2026-127277 at a glance

CVE-2026-127277 is a critical-severity vulnerability in the affected product, with a CVSS 4.0 base score of 9.3. NVD published it on 2026-11-13 and classifies the weakness as CWE-665. FIRST EPSS puts the probability of exploitation activity in the next 30 days at 0.56% (percentile 47.2, scored 2026-11-14). NVD does not list a fixed version, so the vendor advisory is the reference for the fix. Its CVERadar threat level is 47/100.

What it is

A security flaw has been discovered in Linksys EA8100 1.0.3.216940. The affected element is an unknown function of the file etc/init.d/service_smbd.sh of the component SMB Service. Performing a manipulation of the argument ANON_ACCESS results in improper initialization. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

WeaknessCWE-665 definition
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X (source: VulDB)
ATT&CK tacticsn/a

No ATT&CK techniques could be mapped or inferred for this CVE yet.

Patches, mitigations and detection

Fixed versions

NVD does not list a fixed version for this CVE. Use the vendor advisory below.

Derived from the NVD CPE configuration (versionEndExcluding / versionEndIncluding). Always confirm with the vendor advisory.

Vendor advisories and patches

No vendor-tagged reference yet; see the full reference list.

Detection Generic guidance

    Response checklist Generic guidance

    1. Inventory: find every instance of the affected product and version (include internet-facing and forgotten ones).
    2. Patch or mitigate per the vendor advisory; if you cannot patch, remove internet exposure or apply the vendor workaround.
    3. Assume compromise if the system was exposed before patching: hunt for the indicators in the advisory and review logs back to the disclosure date.
    4. Rotate credentials and secrets stored on or used by the affected system if compromise cannot be ruled out.

    If you are not sure which network devices you even have, LayerLogix can audit your network and flag outdated firmware.

    Sources