CVE-2021-34485 | .NET Core and Visual Studio Information Disclosure Vulnerability

.NET Core and Visual Studio Information Disclosure Vulnerability

Published: 2021-08-12 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-34485 is rated Moderate Risk (43.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.26%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-34485

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-23 1.24% 1.26% +0.03%
2 2026-06-15 0.66% 1.24% +0.57%
3 2026-04-09 — 0.66% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-34485

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.3 3.6 [email protected]
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 3.6 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2021-34485

GitHub Security Advisory for CVE-2021-34485

GHSA-vgwq-hfqc-58wv · Severity: medium · Ecosystem: nuget — .NET Core Information Disclosure Vulnerability

OS Trackers for CVE-2021-34485

vendor priority summary link
redhat low — https://access.redhat.com/security/cve/CVE-2021-34485

Affected software / configurations for CVE-2021-34485

Vendor Product Version Raw CPE
microsoft .net >= 5.0, <= 5.0.8 cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
microsoft .net_core >= 2.1, <= 2.1.28 cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*
microsoft .net_core >= 3.1, <= 3.1.17 cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*
microsoft powershell_core >= 7.0, < 7.0.7 cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*
microsoft powershell_core >= 7.1, < 7.1.4 cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*
microsoft visual_studio_2017 >= 15.0, <= 15.9 cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*
microsoft visual_studio_2019 >= 16.0, <= 16.10 cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*

References for CVE-2021-34485

cvelogic Threat Intelligence