Trimble Cityworks Deserialization RCE
CVE-2025-0994 is an insecure deserialization vulnerability in Trimble Cityworks versions prior to 15.8.9 and Cityworks with Office Companion versions prior to 23.10. The flaw is described as a deserialization of untrusted data issue that can be triggered by an authenticated user, allowing remote code execution against the customer’s Microsoft Internet Information Services (IIS) web server hosting the application. Based on the available information, the vulnerable condition exists in application functionality that processes serialized data without sufficient validation or safe deserialization controls.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A zero-day vulnerability in Cityworks that was exploited to deploy the VSHELL malware via the SNOWLIGHT stager.
A specific vulnerability in internet-facing infrastructure cited as being exploited for initial access in Chinese-nexus intrusion campaigns.
Deserialization of untrusted data in Trimble Cityworks that can enable remote code execution; CISA warns of active exploitation.
Небезопасная десериализация в Trimble Cityworks/Office Companion, позволяющая аутентифицированному атакующему выполнить произвольный код на IIS.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.