Vulnerability · Published Oct 26, 2026 · Assigned by Esri
CVE-2026-33521BUG-000186514 - ArcGIS Server has a security vulnerability.
High 7.5
In plain English
A high-severity uncontrolled resource consumption in ArcGIS Server from Esri. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Official description
There is s denial of service vulnerability in Esri ArcGIS Server versions 12.0 and prior that may allow a remote, unauthenticated attacker to supply crafted requests that may, under exceptional circumstances, consume all available worker threads and deny service to users. A patch is provided for ArcGIS Server software in General Availability and Extended support status, which includes versions 12.0, 11.5, 11.3, and 11.1. Other versions are in mature or retired status, which are not patch eligible. Users working with unlisted versions are advised to upgrade and apply the patch.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Esri | ArcGIS Server | 11.1 – before 12.0 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H