CVE-2026-4377

Default credential disclosure via IMEI-derived password

Published May 28, 2026 · Updated May 28, 2026

Weak credentials in D-Link DWR-X1820 1.00B14CP allow physically proximate attackers to derive the default admin password from its IMEI. CERT Polska reports that firmware generates the default credential from the IMEI and does not require a change, enabling administrative authentication. D-Link disputes the report, stating that a random seed is also used, the IMEI requires physical access, first login forces a password change, and repeated failures trigger lockout.

CVSS severity6.0
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak credentials in D-Link DWR-X1820 1.00B14CP allow physically proximate attackers to derive the default admin password from its IMEI. CERT Polska reports that firmware generates the default credential from the IMEI and does not require a change, enabling administrative authentication. D-Link disputes the report, stating that a random seed is also used, the IMEI requires physical access, first login forces a password change, and repeated failures trigger lockout.

The record

CVE
CVE-2026-4377
Published
May 28, 2026
Updated
May 28, 2026
Vendor
D-Link
Product
DWR-X1820
Classifications
CWE-1391, T1078
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.00B14CP <1.00B16CP

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

D-Link · DWR-X1820version=1.00B14CP <1.00B16CP

Published CVSS scores

6.0CERT.PLCVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1391Use of Weak Credentials
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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