CVE-2023-36558 — ASP.NET Core Security Feature Bypass Vulnerability

Executive Summary

None

Overview

5.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Nov 14 2023

Last Updated Nov 14 2023

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.01085 — 0.62342 percentile

NVD CVSS 5.5 MEDIUM — differs from MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.6

EPSS Score

0.01085

probability of exploitation in the next 30 days

0.62342 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

10 affected products

Product	KB Article	Severity	Impact	Restart Required
.NET 6.0	`5032883 (Security Update)`	Important	Security Feature Bypass	Maybe
.NET 7.0	`5032884 (Security Update)`	Important	Security Feature Bypass	Maybe
.NET 8.0	`Release Notes (Security Update)`	Important	Security Feature Bypass	Maybe
ASP.NET Core 6.0	`Release Notes (Security Update)`	Important	Security Feature Bypass	Maybe
ASP.NET Core 7.0	`Release Notes (Security Update)`	Important	Security Feature Bypass	Maybe
ASP.NET Core 8.0	`Release Notes (Security Update)`	Important	Security Feature Bypass	Maybe
Microsoft Visual Studio 2022 version 17.2	`Release Notes (Security Update)`	Important	Security Feature Bypass	Maybe
Microsoft Visual Studio 2022 version 17.4	`Release Notes (Security Update)`	Important	Security Feature Bypass	Maybe
Microsoft Visual Studio 2022 version 17.6	`Release Notes (Security Update)`	Important	Security Feature Bypass	Maybe
Microsoft Visual Studio 2022 version 17.7	`Release Notes (Security Update)`	Important	Security Feature Bypass	Maybe

Patches

3 patches

Article	Type	Restart
`5032883`	Security Update	Maybe
`5032884`	Security Update	Maybe
`Release Notes`	Security Update	Maybe

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

None

References

MSRC Advisory MITRE NVD