CVE-2020-35546

Access-control reset via security-jumper race condition

Published Feb 19, 2025 · Updated Jul 8, 2026

A race condition in Lexmark MX6500e firmware LW75.JD.P296 and earlier allows physically proximate attackers to reset access controls. Boot-time processing of the two security-jumper states can misread an unchanged jumper as changed and restore security access controls to defaults. This requires a power-on or reboot and removes protections supplied by the prior access-control configuration; no data alteration or service interruption is reported.

CVSS severity4.6
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Lexmark MX6500e firmware LW75.JD.P296 and earlier allows physically proximate attackers to reset access controls. Boot-time processing of the two security-jumper states can misread an unchanged jumper as changed and restore security access controls to defaults. This requires a power-on or reboot and removes protections supplied by the prior access-control configuration; no data alteration or service interruption is reported.

The record

CVE
CVE-2020-35546
Published
Feb 19, 2025
Updated
Jul 8, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-284
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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

4.6LexmarkCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

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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