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CVE-2024-38140: Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

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CRITICAL 9.8REMOTEWATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2024-38140 is a critical-severity flaw (CVSS 9.8) affecting windows 10 1507, windows 10 1607, windows 10 1809. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

Why this priority

  • Critical severity
  • EPSS top 10%: very likely to be exploited
  • CISA SSVC: automatable with total technical impact
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance3.8% (top 10%)
CISA exploited listNo
WeaknessCWE-416
Published2024-08-13
Last modified2026-06-17
Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

microsoft windows 10 1507 UPGRADE
Affected: < 10.0.10240.20751
Fixed in: 10.0.10240.20751
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 1607 UPGRADE
Affected: < 10.0.14393.7259
Fixed in: 10.0.14393.7259
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 1809 UPGRADE
Affected: < 10.0.17763.6189
Fixed in: 10.0.17763.6189
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 21h2 UPGRADE
Affected: < 10.0.19044.4780
Fixed in: 10.0.19044.4780
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 10 22h2 UPGRADE
Affected: < 10.0.19045.4780
Fixed in: 10.0.19045.4780
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
microsoft windows 11 21h2 UPGRADE
Affected: < 10.0.22000.3147
Fixed in: 10.0.22000.3147
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · noctalia · FIXED · 5.4.1-1.fc46 · FEDORA-2026-a4755e8ef7 · source
sudo dnf upgrade --advisory=FEDORA-2026-a4755e8ef7
Fedora ELN · efifs · FIXED · 1.13-1.eln159 · FEDORA-2026-3fd0bb7307 · source
sudo dnf upgrade --advisory=FEDORA-2026-3fd0bb7307

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-38140?

windows 10 1507: upgrade to 10.0.10240.20751; windows 10 1607: upgrade to 10.0.14393.7259; windows 10 1809: upgrade to 10.0.17763.6189. Exact commands for each OS are on this page.

Is CVE-2024-38140 being exploited?

CVE-2024-38140 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-38140 affect?

CVE-2024-38140 affects windows 10 1507, windows 10 1607, windows 10 1809. Severity is critical (CVSS 9.8). Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

How urgent is CVE-2024-38140?

Priority 70/100. Critical severity; EPSS top 10%: very likely to be exploited; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Windows vulnerabilities

Related CVEs

References

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