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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2025-10363

CRITICAL · 10.0 CVSS v4.0 Published 2025-10-06
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Deserialization of Untrusted Data vulnerability in Topal Solutions AG Topal Finanzbuchhaltung on Windows allows Remote Code Execution.This issue affects at least Topal Finanzbuchhaltung: 10.1.5.20 and is fixed in version 11.2.12.00

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A deserialization vulnerability in Topal Finanzbuchhaltung (accounting software) on Windows allows remote attackers to execute arbitrary code by deserializing untrusted data. This critical RCE flaw affects version 10.1.5.20 and was patched in version 11.2.12.00.

MitigationUpgrade Topal Finanzbuchhaltung to version 11.2.12.00 or later. As an interim measure, restrict network access to the affected system and disable unnecessary services to reduce attack surface.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
Y
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Locate Topal Finanzbuchhaltung installation
    Open Control Panel > Programs and Features, or check Program Files directory for a folder named 'Topal' or 'Finanzbuchhaltung'. Also check the Windows registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall for an entry containing 'Topal' or 'Finanzbuchhaltung'.
    Affected if The application is found installed on the system
  2. Identify installed version number
    Right-click the Topal Finanzbuchhaltung executable (typically Topal.exe in the installation folder), select Properties, and view the Details tab for the Product Version field. Alternatively, right-click the uninstall entry in Programs and Features and check the version displayed.
    Affected if The displayed version is 10.1.5.20 or any version between 10.1.5.20 and 11.2.12.00 (excluding 11.2.12.00 and later)
  3. Verify network-exposed services
    Check if Topal Finanzbuchhaltung is configured to accept remote connections or deserialized data from external sources. Review any configured data import features, RPC endpoints, or listening services within the application's configuration files or settings.
    Affected if The application accepts deserialized data from network sources or has remote data import features enabled

You are affected if Topal Finanzbuchhaltung is installed with version 10.1.5.20 or any version prior to 11.2.12.00 and the application accepts remote or external deserialized data.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade Topal Finanzbuchhaltung to version 11.2.12.00 or later. As an interim measure, restrict network access to the affected system and disable unnecessary services to reduce attack surface.

Recommended fix High confidence

11.2.12.00

  1. Create a complete backup of the Topal Finanzbuchhaltung database and configuration files before upgrading
  2. Review Topal Solutions AG release notes and documentation for version 11.x to understand new features and any configuration changes required
  3. Verify that existing custom integrations, templates, or add-ons are compatible with version 11.x
  4. Download the fixed version 11.2.12.00 from the official Topal Solutions AG source or authorized distributor
  5. Follow the vendor's official upgrade procedure to install version 11.2.12.00
  6. After installation, verify the application starts successfully and confirm all core functionalities work properly
  7. Validate that the deserialization vulnerability is no longer present by reviewing system logs for any related errors
Caveat Upgrading from version 10.x to 11.x may introduce breaking changes in functionality, configuration formats, or API compatibility; thoroughly test in a non-production environment first

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-10363 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data