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Critical

Hard-coded Default Password Exposure in Device Firmware

IdentifiersCVE-2026-35075CWE-1393· Use of Default Password

CVE-2026-35075 is a vulnerability in affected device firmware where a default, hard-coded password can be recovered from the firmware image. According to the provided advisory context, an unauthenticated remote attacker can extract or recover this embedded credential and then use it to authenticate to affected devices. The issue stems from the presence of a static default password in firmware rather than a unique per-device secret or securely managed credential. Successful use of the recovered password results in full access to affected devices.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an unauthenticated attacker to obtain the hard-coded default password from the firmware image and use it to gain full access to affected devices. The provided CVSS vectors indicate high impact to confidentiality, integrity, and availability, implying complete compromise of device functions and data exposed through the affected access path.

Mitigation

If you can’t patch tonight, do this now.

Until a vendor fix is applied, restrict network exposure of affected devices to trusted management networks only, disable remote administrative access where feasible, and enforce access controls such as firewall rules or VPN-only administration. Change default credentials if the platform permits it, monitor for unauthorized logins, and review device configurations for signs of compromise. If the credential is immutable or embedded, mitigation is limited and device isolation becomes the primary compensating control.

Remediation

Patch, then assume compromise.

Apply the vendor-provided fix or updated firmware referenced by the CERT@VDE advisory VDE-2026-039, if available. Remediation should remove the hard-coded default password from firmware and replace it with a secure per-device or administrator-defined credential model. If the product supports credential rotation, change any default or recoverable passwords immediately after updating. Because the provided content does not include vendor-specific patch instructions, further remediation details are currently not available from the supplied material.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
MBSDouble A Profibus Firmwareoperating_system
MBSDouble A X Link Firmwareoperating_system
MBSDouble X Can Firmwareoperating_system
MBSDouble X Dali Firmwareoperating_system
MBSDouble X Knx Firmwareoperating_system
MBSDouble X Lon Firmwareoperating_system
MBSDouble X M Bus Firmwareoperating_system
MBSDouble X Profinet Firmwareoperating_system
MBSDouble X X Link Firmwareoperating_system
MBSSingle A Firmwareoperating_system
MBSSingle X Firmwareoperating_system
MBSTriple X Knx Dali Firmwareoperating_system
MBSTriple X Knx Lon Firmwareoperating_system
MBSTriple X Knx M Bus Firmwareoperating_system
MBSTriple X Profinet Dali Firmwareoperating_system
MBSTriple X Profinet Knx Firmwareoperating_system
MBSTriple X Profinet Lon Firmwareoperating_system
MBSTriple X Profinet M Bus Firmwareoperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

7 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity6

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-35075
NVD
nvd.nist.gov/vuln/detail/CVE-2026-35075
MITRE CWE · CWE-1393
Use of Default Password
certvde.com
certvde.com/en/advisories/VDE-2026-039