Vulnerability · CVE-2021-34532
ASP.NET Core and Visual Studio Information Disclosure Vulnerability
Published Aug 12, 2021 · catalog updated Nov 2, 2026 · asp.net core
Last checked Nov 8, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2021-34532. EPSS is 1.22%. Act only if a listed version of asp.net core is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-88092 · Critical
- CVE-2026-69304 · Medium
- CVE-2026-45591 · High
- CVE-2026-40372 · Critical
- CVE-2025-55315 · Critical
- Severity
- Medium5.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 1.22%
- Remediation
- Version ranges on file
- Affected products
- cpe microsoft/asp.net core · cpe microsoft/visual studio 2019
ASP.NET Core and Visual Studio Information Disclosure Vulnerability
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe microsoft/asp.net core>= 2.1, <= 2.1.2
- cpe microsoft/asp.net core>= 3.1, <= 3.1.17
- cpe microsoft/asp.net core>= 5.0, <= 5.0.8
- cpe microsoft/visual studio 20198.10
- cpe microsoft/visual studio 2019>= 16.0, <= 16.10
How to fix CVE-2021-34532
Upgrade
CVE-2021-34532 lists a fix boundary at 2.1.2. Compare the installed build with that boundary before you change production.
Version check
Affected <= 2.1.2
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2021-34532. EPSS is 1.22%. Act only if a listed version of asp.net core is installed.
Which versions are affected?
Compare what you have installed with microsoft/asp.net core >= 2.1, <= 2.1.2; microsoft/asp.net core >= 3.1, <= 3.1.17; microsoft/asp.net core >= 5.0, <= 5.0.8; microsoft/visual studio 2019 8.10. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 1.22%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Aug 12, 2021 · NIST NVD
Detected
ASP.NET Core and Visual Studio Information Disclosure Vulnerability
Nov 2, 2026 · NIST NVD
Updated
ASP.NET Core and Visual Studio Information Disclosure Vulnerability
Sources
- CVE.orgVulnerability recordCVE-2021-34532
Official CVE identifier
cve.org - Monitored products — highVendor advisoryCVE-2021-34532
ASP.NET Core and Visual Studio Information Disclosure Vulnerability
nvd.nist.gov - NIST NVDVulnerability recordCVE-2021-34532
ASP.NET Core and Visual Studio Information Disclosure Vulnerability
nvd.nist.gov
References
Freshness
Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- Monitored products — highNov 8, 2026
- CVE.orgNov 4, 2026
- NIST NVDNov 3, 2026