How severe is CVE-2026-4377?

CVE-2026-4377 has a CVSS 4.0 base score of 6.0, rated medium severity.

Is CVE-2026-4377 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4377?

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

Does CVE-2026-4377 have an EU (EUVD) identifier?

Yes. CVE-2026-4377 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32860.

When was CVE-2026-4377 published?

CVE-2026-4377 was published on 2026-05-28 and last updated on 2026-06-17.

CVE-2026-4377

CVE-2026-4377 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.0. 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-1391.

Key facts

Severity: Medium (CVSS 4.0 base score 6.0)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32860
Weakness: CWE-1391
Published: 2026-05-28
Last modified: 2026-06-17

Description

Dlink DWR-X1820 router uses weak default password generated from its IMEI number and does not require users to change it. An attacker who knows how passwords are generated can easily crack the default password if they have the device IMEI number. This issue was fixed in version 1.00B16CP.

Frequently asked questions

What is CVE-2026-4377?: Dlink DWR-X1820 router uses weak default password generated from its IMEI number and does not require users to change it. An attacker who knows how passwords are generated can easily crack the default password if they have the device IMEI number. This issue was fixed in version 1.00B16CP.
How severe is CVE-2026-4377?: CVE-2026-4377 has a CVSS 4.0 base score of 6.0, rated medium severity.
Is CVE-2026-4377 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-4377?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4377 have an EU (EUVD) identifier?: Yes. CVE-2026-4377 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32860.
When was CVE-2026-4377 published?: CVE-2026-4377 was published on 2026-05-28 and last updated on 2026-06-17.

References

Other CWE-1391 vulnerabilities

CVE-2025-67114 — Critical (CVSS 9.8): Use of a deterministic credential generation algorithm in /ftl/bin/calc_f2 in Small Cell Sercomm SCE4255W (FreedomFi…
CVE-2026-22886 — Critical (CVSS 9.8): OpenMQ exposes a TCP-based management service (imqbrokerd) that by default requires authentication. However, the…
CVE-2025-30519 — Critical (CVSS 9.8): Dover Fueling Solutions ProGauge MagLink LX4 Devices have default root credentials that cannot be changed through…
CVE-2025-6077 — Critical (CVSS 9.8): Partner Software's Partner Software Product and corresponding Partner Web application use the same default username and…
CVE-2024-51978 — Critical (CVSS 9.8): An unauthenticated attacker who knows the target device's serial number, can generate the default administrator…
CVE-2024-12728 — Critical (CVSS 9.8): A weak credentials vulnerability potentially allows privileged system access via SSH to Sophos Firewall older than…

Browse all CWE-1391 vulnerabilities →