Microsoft QUIC Information Disclosure Vulnerability

Source data

Overview

Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.

Impact & technical details

Information Disclosure

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system. Successful exploitation is not guaranteed and depends on a combination of factors that might include the environment, system configuration, and the presence of additional security measures.

What type of information could be disclosed by this vulnerability? An attacker who successfully exploited this vulnerability could view heap memory from a privileged process running on the server.

CVSS base score

5.9 / 10

CVSS vector

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

Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.

Affected products

• Microsoft Visual Studio 2022 version 17.14
• Microsoft Visual Studio 2026 version 18.10
• Microsoft.Native.Quic.MsQuic.Schannel on .NET 10.0 runtime installed on Windows
• Microsoft.Native.Quic.MsQuic.Schannel on .NET 11.0 runtime installed on Windows
• Microsoft.Native.Quic.MsQuic.Schannel on .NET 8.0 runtime installed on Windows
• Microsoft.Native.Quic.MsQuic.Schannel on .NET 9.0 runtime installed on Windows
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems

Source guidance

Remediation

• Release Notes

At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.

Authoritative sources & updates

Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.

• Microsoft Security Response Center (opens in a new tab)
• Microsoft security update · 5127648 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · Release Notes (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · Release Notes (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126655 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126646 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5126653 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127646 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)