CVE-2025-0994
RCE in Trimble Cityworks ≤ 15.8.9
Raw vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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:X/R:X/V:X/RE:X/U:XCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2025-0994 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Trimble Cityworks. Its CVSS base score is 8.6 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked in the top 2% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.
The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
Trimble Cityworks versions prior to 15.8.9 and Cityworks with Office Companion versions prior to 23.10 contain a deserialization vulnerability tracked as CVE-2025-0994 and CWE-502. The flaw resides in the application’s handling of serialized data and affects deployments running on Microsoft Internet Information Services web servers, carrying a CVSS 4.0 score of 8.6.
An authenticated user can supply malicious serialized objects over the network to trigger remote code execution on the underlying IIS server, achieving full control over the web application process without user interaction.
CISA’s ICS advisory ICSA-25-037-04 and Trimble’s customer communication direct organizations to upgrade to the fixed releases and reference the vendor’s patch documentation. The vulnerability is also listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild.
EPSS for the issue rose from lower values after disclosure to a peak of 0.7780 on 2025-12-11 before receding to the current 0.7486, indicating growing exploitation interest several months post-publication.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-1955
Vulnerability Data
Trimble Cityworks versions prior to 15.8.9 and Cityworks with office companion versions prior to 23.10 are vulnerable to a deserialization vulnerability. This could allow an authenticated user to perform a remote code execution attack against a customer’s Microsoft Internet Information…
more
Services (IIS) web server.
- CWE(s)
- KEV Date Added
- 07 February 2025
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and evaluation can uncover deserialization flaws before deployment.
Input validation directly stops deserialization of untrusted data by ensuring inputs are valid before processing.
Engineering principles such as safe deserialization and input sanitization structurally prevent the weakness from being introduced.
Integrity verification tools can detect malformed or tampered serialized data after the fact.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing includes validation of deserialization routines and the use of untrusted data, reducing the likelihood that unsafe object reconstruction will be deployed.
Requiring vetted libraries, regular updates and SAST before release reduces the likelihood that deserialization logic will accept and act on attacker-controlled serialized objects.
Regular scanning of third-party libraries and timely patching reduce the likelihood that unsafe deserialization vulnerabilities remain active.