CVE-2026-52533Public exploit

Root access via hard-coded UART credentials

Published Jul 13, 2026 · Updated Jul 13, 2026

Hard-coded credentials in D-Link DIR-1253 firmware 1.0.1.250923.142435 allow physically proximate attackers to gain root access. The firmware's /etc/shadow file embeds reusable password hashes for the privileged root and tmadmin accounts. Exploitation requires access to the device's UART serial console, where the credentials permit an interactive login and full control of the router.

CVSS severity9.8
Critical
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in D-Link DIR-1253 firmware 1.0.1.250923.142435 allow physically proximate attackers to gain root access. The firmware's /etc/shadow file embeds reusable password hashes for the privileged root and tmadmin accounts. Exploitation requires access to the device's UART serial console, where the credentials permit an interactive login and full control of the router.

The record

CVE
CVE-2026-52533
Published
Jul 13, 2026
Updated
Jul 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-269, T1078.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1078.001Default Accounts

Public exploit references

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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