# UNC5174 + uncategorized Russian-nexus cluster

> As of 2026-05-30, UNC5174 + uncategorized Russian-nexus cluster is a China / Russia-nexus threat actor tracked by Threadlinqs Intelligence across 1 threat spanning vulnerability. Also known as UNC5174, Uteus, Uetus, CASTLERUN.

- **Nation:** China / Russia
- **Tracked threats:** 1
- **Categories:** VULNERABILITY
- **Also known as:** UNC5174, Uteus, Uetus, CASTLERUN
- **As of:** 2026-05-30

## Tracked threats

- [CitrixBleed 3 — CVE-2026-3055 & CVE-2026-4368 NetScaler ADC/Gateway Memory Overread and Session Hijack](https://intel.threadlinqs.com/threat/TL-2026-0384) — CRITICAL

## Related CVEs

4 CVEs referenced by tracked UNC5174 + uncategorized Russian-nexus cluster activity.

- [CVE-2026-4368](https://intel.threadlinqs.com/cve/CVE-2026-4368)
- [CVE-2026-3055](https://intel.threadlinqs.com/cve/CVE-2026-3055)
- [CVE-2025-5777](https://intel.threadlinqs.com/cve/CVE-2025-5777)
- [CVE-2023-4966](https://intel.threadlinqs.com/cve/CVE-2023-4966)

## Full data

Infrastructure, IOC values and detection queries (Splunk SPL / Microsoft KQL / Sigma) require the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp

Canonical: https://intel.threadlinqs.com/actor/UNC5174%20%2B%20uncategorized%20Russian-nexus%20cluster