Security Digest · Vulnerability record
CVE-2024-43498: .NET Remote Code Execution Vulnerability
.NET and Visual Studio Remote Code Execution Vulnerability
CVSS 9.2 Critical EPSS 3.6% · p89
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 3.6%, percentile 89: FIRST’s model estimates a 3.6% chance of exploitation activity in the next 30 days, higher than 89% 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
System.Formats.Nrbf(NuGet) < 9.0.0, fixed in 9.0.0. 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-2024-43498 | .NET Remote Code Execution Vulnerability
Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 9.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
A remote unauthenticated attacker could exploit this vulnerability by sending specially crafted requests to a .NET vulnerable webapp or loading a specially crafted file into a vulnerable application.
Announcement
Weakness type: CWE-843.
Product: System.Formats.Nrbf (NuGet) · Assigned by: microsoft · Published: 2024-11-12
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| NuGet | System.Formats.Nrbf | < 9.0.0 | 9.0.0 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Microsoft | PowerShell 7.5 | 7.5.0 < 7.5.0 |
| Microsoft | Microsoft Visual Studio 2022 version 17.8 | 17.8.0 < 17.8.16 |
| Microsoft | Microsoft Visual Studio 2022 version 17.6 | 17.6.0 < 17.6.21 |
| Microsoft | Microsoft Visual Studio 2022 version 17.10 | 17.10 < 17.10.9 |
| Microsoft | Microsoft Visual Studio 2022 version 17.11 | 17.11 < 17.11.6 |
| Microsoft | .NET 9.0 | 9.0.0 < 9.0.0 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoft | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| GitHub | 4.0 | 9.2 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
- 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 yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 3.59% probability of exploitation activity in the next 30 days; percentile 89.
Timeline
- — CVE record published by microsoft
- — GitHub-reviewed advisory GHSA-v7vf-f5q6-m899 published (critical)
- — 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
- .NET and Visual Studio Remote Code Execution Vulnerability msrc.microsoft.com
Vulnerability records
- GitHub Advisory GHSA-v7vf-f5q6-m899 github.com
- CVE.org record CVE-2024-43498 cve.org
- NVD entry CVE-2024-43498 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com