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CVE-2021-41355

29
FAUCET Score

CVE-2021-41355 is an information disclosure vulnerability affecting Microsoft .NET Core, Visual Studio 2019, and PowerShell. This medium-severity flaw (CVSS 5.7) requires adjacent network access and user interaction (UI:R) for an attacker to potentially disclose sensitive information. While not actively exploited (KEV: No) and lacking public exploit code, it has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
5.0CPE matchmatch criteria
cpe:2.3:a:microsoft:.net:5.0:*:*:*:*:*:*:*
>= 7.1, < 7.1.5CPE matchmatch criteria
cpe:2.3:a:microsoft:powershell:*:*:*:*:*:*:*:*
>= 16.0, <= 16.11CPE matchmatch criteria
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.7MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.1
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
20.34%
Probability of exploitation in next 30 days
EPSS Percentile
97.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2034 is in the 100th percentile among its peer group of 126 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

microsoftpatch availablevia msrc
Product: .NET 5.0Fixed in: 5.0.11
View patch
microsoftpatch availablevia msrc
Product: Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)Fixed in: 16.9.12
View patch
microsoftpatch availablevia msrc
Product: Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10)Fixed in: 16.11.5
View patch
microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: PowerShell 7.1Fixed in: 7.1.5
View patch
nugetpatch availablevia ghsa
Product: System.DirectoryServices.ProtocolsFixed in: 5.0.1
redhatpatch availablevia redhat_api
Product: .NET Core on Red Hat Enterprise LinuxFixed in: rh-dotnet50-dotnet-0:5.0.208-1.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: dotnet5.0-0:5.0.208-1.el8_4
View patch

Vendor Advisories (3)

nugetGHSA-9cxh-gqpx-qc5mmedium

Credential Disclosure in System.DirectoryServices.Protocols

Oct 12, 2021
redhatCVE-2021-41355Important

dotnet: System.DirectoryServices.Protocols.LdapConnection sends credentials in plaintext if TLS handshake fails

Oct 12, 2021
microsoft2021-Oct/CVE-2021-41355Important

.NET Core and Visual Studio Information Disclosure Vulnerability

Oct 12, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-41355
PatchVendor Advisory
oracle.com / security-alerts/cpujan2022.html
Not ApplicableThird Party Advisory