CVE-2026-33521— BUG-000186514 - ArcGIS Server has a security vulnerability.

Quick assessment

Affected

Esri ArcGIS Server

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Esri ArcGIS Server 12.0 及更早版本中存在一个拒绝服务漏洞。在极少数情况下，远程未认证攻击者可构造特殊请求，耗尽所有可用工作线程，从而导致用户无法获得服务。针对处于“正式发布”和“扩展支持”状态的 ArcGIS Server 软件（包括 12.0、11.5、11.3 和 11.1 版本），已提供修复补丁。其他版本已处于“成熟”或“已退役”状态，不符合补丁修复条件。建议使用未列入上述版本的用户进行升级并应用补丁。

CVSS 7.5 · High Updated Oct 27, 2026

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

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Vulnerability Information

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Vulnerability Title

BUG-000186514 - ArcGIS Server has a security vulnerability.

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

未加控制的资源消耗(资源穷尽)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Esri	ArcGIS Server	11.1 ~ 12.0	-

II. Public POCs for CVE-2026-33521

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-33521

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Other References for CVE-2026-33521 (1)

https://www.esri.com/arcgis-blog/products/trust-arcgis/administration/october-2026-arcgis-security-bulletin

https://www.cve.org/CVERecord?id=CVE-2026-33521

Same Patch Batch · Esri · 2026-10-26 · 6 CVEs total

CVE-2026-10757	9.8 CRITICAL	BUG-000187511 - ArcGIS Server has a security vulnerability.
CVE-2026-33520	6.1 MEDIUM	BUG-000185167 - ArcGIS Server has a security vulnerability.
CVE-2026-50096	6.1 MEDIUM	BUG-000187164 - ArcGIS Server has a security vulnerability.
CVE-2026-50095	6.1 MEDIUM	BUG-000187165 - ArcGIS Server has a security vulnerability.
CVE-2026-33522	5.3 MEDIUM	BUG-000182936 - ArcGIS Server has a security vulnerability.

IV. Related Vulnerabilities

Same product: ArcGIS Server

Same vendor: Esri

Same weakness: CWE-400