CVE-2024-35264: Microsoft Security Advisory CVE-2024-35264 | .NET Remote Code Execution Vulnerability

Should you act?

Critical and remotely reachable

No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
• EPSS 2.6%, percentile 85: FIRST’s model estimates a 2.6% chance of exploitation activity in the next 30 days, higher than 85% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Only applies if your dependency tree includes Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) >= 8.0.0, <= 8.0.6, fixed in 8.0.7; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) >= 8.0.0, <= 8.0.6, fixed in 8.0.7; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet) >= 8.0.0, <= 8.0.6, fixed in 8.0.7; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) >= 8.0.0, <= 8.0.6, fixed in 8.0.7. Check your lockfile, including transitive dependencies.

What it is

.NET and Visual Studio Remote Code Execution Vulnerability

From the GitHub advisory

Microsoft Security Advisory CVE-2024-35264 | .NET Remote Code Execution Vulnerability

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A Vulnerability exists in ASP.NET Core 8 where Data Corruption in Kestrel HTTP/3 can result in remote code execution.

Note: HTTP/3 is experimental in .NET 6.0. If you are on .NET 6.0 and using HTTP/3, please upgrade to .NET 8.0.7

Weakness type: CWE-416.

Product: Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) · Assigned by: microsoft · Published: 2024-07-09

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: present (depends on deployment conditions)
• Privileges required: none (no login)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation none, automatable no, technical impact total.
• FIRST EPSS (model of 2026-10-21): 2.56% probability of exploitation activity in the next 30 days; percentile 85.

Timeline

• 2024-07-09 — CVE record published by microsoft
• 2024-07-09 — GitHub-reviewed advisory GHSA-chfc-9w6m-75rf published (critical)
• 2026-02-10 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. .NET and Visual Studio Remote Code Execution Vulnerability msrc.microsoft.com

Vulnerability records

1. GitHub Advisory GHSA-chfc-9w6m-75rf github.com
2. CVE.org record CVE-2024-35264 cve.org
3. NVD entry CVE-2024-35264 nvd.nist.gov

Other references from the CVE record and advisory

1. herodevs.com herodevs.com
2. github.com github.com

Critical NuGet advisories · Today’s Security Digest