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7.5
CVE-2026-33521PATCHED
esri · arcgis server

BUG-000186514 - ArcGIS Server has a security 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.

Affected Products

VendorProductVersions
esriarcgis server11.1

References

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

Related News (1 articles)

Tier C
VulDB21h ago
CVE-2026-33521 | Esri ArcGIS Server up to 11.x denial of service
→ No new info (linked only)

Discussion (0)

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CVSS 3.17.5 HIGH
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA KEV❌ No
Actively exploited❌ No
Patch available
12.0
CWECWE-400
PublishedOct 26, 2026
Last enriched21h agov2
Trending Score34
Source articles1
Independent1
Info Completeness9/14
Missing: epss, kev, exploit, iocs, mitre_attack

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Related CVEs (5)

CRITICALCVE-2026-10757
BUG-000187511 - ArcGIS Server has a security vulnerability.
Trending: 42
MEDIUMCVE-2026-33522
BUG-000182936 - ArcGIS Server has a security vulnerability.
Trending: 31
MEDIUMCVE-2026-50095
BUG-000187165 - ArcGIS Server has a security vulnerability.
Trending: 21
MEDIUMCVE-2026-33520
BUG-000185167 - ArcGIS Server has a security vulnerability.
Trending: 21
MEDIUMCVE-2026-50096
BUG-000187164 - ArcGIS Server has a security vulnerability.
Trending: 21

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Verification

State: unverified
Confidence: 0%

Vulnerability Timeline

CVE Published
Oct 26, 2026
Discovered by ZDM
Oct 26, 2026
Updated: affectedVersions
Oct 26, 2026
Patch Available
Oct 26, 2026

Version History

v2
Last enriched 21h ago
v2Tier C21h ago

Article indicates vulnerability affects ArcGIS Server up to 11.x, suggesting versions 11.5 and 11.3 are also affected (not just 11.1 as currently recorded); version 12.0 should be added to affected versions list.

affectedVersions
via VulDB
v121h ago

Initial creation