# CVE-2026-20200 — Cisco Unified Computing System (Standalone)

> As of 2026-08-06, CVE-2026-20200 is a HIGH-severity vulnerability in Cisco Unified Computing System (Standalone), CVSS v3.1 8.8, EPSS 0.8% (54.9th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-20200, most recently “Critical Cisco IMC Argument Injection (CVE-2026-20200) Enables Root RCE on UCS C-Series M7/M8 Standalone Servers — Public PoC (CIMCown)”.

**Last updated:** 2026-08-06

## What is CVE-2026-20200?

A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with low privileges to execute arbitrary commands on the underlying operating system of an affected system and elevate privileges to root. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by entering crafted inputs to the web-based management interface of the affected software. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system as the root user.

The record classifies CVE-2026-20200 under weakness class [CWE-141](https://cwe.mitre.org/data/definitions/141.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 61 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.8% probability of exploitation in the next 30 days, higher than 54.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 8.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-05, last modified 2026-08-06

## Is CVE-2026-20200 being exploited?

Weaponised exploit code for CVE-2026-20200 is publicly available. 1 public proof-of-concept repository is tracked for this identifier.

- [NSIDE-ATTACK-LOGIC/CIMCown](https://github.com/NSIDE-ATTACK-LOGIC/CIMCown) (github)

## Affected products and versions

- [Cisco](https://intel.threadlinqs.com/vendors/cisco): Unified Computing System (Standalone)

## How to fix CVE-2026-20200

No vendor patch reference has been recorded for CVE-2026-20200 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-20200

1 tracked threat in the Threadlinqs corpus references CVE-2026-20200, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Critical Cisco IMC Argument Injection (CVE-2026-20200) Enables Root RCE on UCS C-Series M7/M8 Standalone Servers — Public PoC (CIMCown)](https://intel.threadlinqs.com/threat/TL-2026-1912) — CRITICAL · 2026-08-06

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-08-17. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [sec.cloudapps.cisco.com](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cimc-arg-inject-upSHdMfU)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-20200
Full detection coverage and IOCs for threats exploiting CVE-2026-20200 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp