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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2025-0994 — Cityworks

HIGH

CVE-2025-0994 is a high-severity (CVSS 8.8) Deserialization of Untrusted Data vulnerability in trimble cityworks. It is in CISA's Known Exploited Vulnerabilities catalog (added 2025-02-07) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

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…

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 24, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2025-02-07. Federal agencies were required to remediate by 2025-02-28.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2025-0994.

EPSS Exploitation Probability

via FIRST.org ↗
31.1%probability of exploitation in next 30 days
Moderate Risk-0.22%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
13.2%38.5%63.8%89.1%74.7%31.1%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2025-0994 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

Description

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 Services (IIS) web server.

Affected Products

1 product · 2 configurations
Application
cityworkstrimble
≥ 23.0 && < 23.10
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

rxerium/CVE-2025-0994

Cityworks deserialization of untrusted data vulnerability Detection

⭐ 4🍴 0Oct 2025

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every trimble cityworks deployment and check each version against the affected-products list above.

  2. Fix

    Apply the trimble cityworks security patch or hotfix for CVE-2025-0994 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

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 Services (IIS) web server.
O3 Security · Runtime Protection

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CVE-2025-0994: Cityworks Deserialization (High 8.8, KEV)