CVE-2025-10363Public exploitNetwork attack vector

Unauthenticated SYSTEM code execution via crafted protocol header

Published Oct 6, 2025 · Updated Oct 6, 2025

Deserialization in Topal Solutions AG Topal Finanzbuchhaltung 10.1.5.20 allows remote attackers to execute code over TCP. A manipulated 32-byte header selects BinaryFormatter instead of XML in the server's ReadDS() path, causing attacker-supplied .NET objects to be deserialized. The custom TCP message is accepted before authentication, and successful exploitation runs code as SYSTEM on the Windows server.

CVSS severity10.0
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Topal Solutions AG Topal Finanzbuchhaltung 10.1.5.20 allows remote attackers to execute code over TCP. A manipulated 32-byte header selects BinaryFormatter instead of XML in the server's ReadDS() path, causing attacker-supplied .NET objects to be deserialized. The custom TCP message is accepted before authentication, and successful exploitation runs code as SYSTEM on the Windows server.

The record

CVE
CVE-2025-10363
Published
Oct 6, 2025
Updated
Oct 6, 2025
Vendor
Topal Solutions AG
Product
Topal Finanzbuchhaltung
Classifications
CWE-502, CAPEC-88, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2025Record 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=10.1.5.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Topal Solutions AG · Topal Finanzbuchhaltungversion=10.1.5.20

Published CVSS scores

10.0NCSC.chCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-88OS Command Injection
T1190Exploit Public-Facing Application

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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