Threat Intelligence / CVE / CVE-2023-36899

CVE-2023-36899 — Microsoft .net Framework 4.8

CVSS v3.1 8.8 (HIGH) · EPSS 70.0% (higher than 98.6% of all scored CVEs) · Priority 8.3/10 · Published 2023-08-08

As of 2024-11-21, CVE-2023-36899 is a HIGH-severity vulnerability in Microsoft .net Framework 4.8, CVSS v3.1 8.8, EPSS 70.0% (98.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-36899, most recently “UAT-8099 (China) BadIIS Malware Campaign Targeting IIS Servers for SEO Fraud”.

Last updated: 2024-11-21

What is CVE-2023-36899?

ASP.NET Elevation of Privilege Vulnerability

The record classifies CVE-2023-36899 under weakness classes CWE-20, NVD-CWE-noinfo. 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. 27 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1132 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): 70.0% probability of exploitation in the next 30 days, higher than 98.6% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 8.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2023-08-08, last modified 2024-11-21

Is CVE-2023-36899 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

Affected products and versions

Microsoft: .net Framework 4.8, Windows Server 2008 r2, Windows Server 2012, Windows Server 2012 r2, Windows Server 2016, .net Framework 4.6.2, .net Framework 4.7, .net Framework 4.7.1, .net Framework 4.7.2, Windows Server 2008, .net Framework 3.5, .net Framework 4.8.1, Windows 10 1809, Windows 10 21h2, Windows 10 22h2, Windows 11 21h2, Windows Server 2019, Windows Server 2022, .net Framework 2.0

Showing 19 of 27 recorded product entries.

How to fix CVE-2023-36899

The record marks a vendor fix as available for CVE-2023-36899. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36899. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36899. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2023-36899

1 tracked threat in the Threadlinqs corpus references CVE-2023-36899, either in the campaign’s CVE list or as an indicator on the campaign record.

UAT-8099 (China) BadIIS Malware Campaign Targeting IIS Servers for SEO Fraud — HIGH · 2026-02-02

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

msrc.microsoft.com

Full detection coverage & IOCs for threats exploiting CVE-2023-36899 are available via the Threadlinqs MCP server (Purple tier). View plans →

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