PatchTheCVECVE-2026-33824: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability
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CRITICAL 9.8EXPLOITEDREMOTEWATCHLISTUPGRADEUPGRADEUPGRADE
CVE-2026-33824 is a critical-severity flaw (CVSS 9.8) affecting windows 10 1607, windows 10 1809, windows 10 21h2, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
Why this priority
- Critical severity
- EPSS top 1%: very likely to be exploited
- Exploited in the wild (CISA KEV)
- Public exploit reference
- 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 score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 77.1% (top 1%) |
| CISA exploited list | Yes, fix due 2026-08-21 |
| Weakness | CWE-415 |
| Published | 2026-04-14 |
| Last modified | 2026-09-25 |
Publisher (CNA): Microsoft Corporation · Vendor: microsoft
Last updated 2026-09-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Deadline CISA due date for US federal agencies to patch
- Updated Record last modified
microsoft windows 10 1607 UPGRADE
Affected: < 10.0.14393.9060
Fixed in: 10.0.14393.9060
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: < 10.0.17763.8644
Fixed in: 10.0.17763.8644
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: < 10.0.19044.7184
Fixed in: 10.0.19044.7184
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: < 10.0.19045.7184
Fixed in: 10.0.19045.7184
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 23h2 UPGRADE
Affected: < 10.0.22631.6936
Fixed in: 10.0.22631.6936
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 24h2 UPGRADE
Affected: < 10.0.26100.8246
Fixed in: 10.0.26100.8246
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 · icecat · FIXED · 153.6.0-2.rh1.fc46 · FEDORA-2026-25e05b5320 · source
sudo dnf upgrade --advisory=FEDORA-2026-25e05b5320
Fedora ELN · edk2 · FIXED · 20260812-14.eln159 · FEDORA-2026-8850ef9153 · source
sudo dnf upgrade --advisory=FEDORA-2026-8850ef9153
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: EpSiLoNPoInTOrI/IKEV2-POC (7 stars)
- GitHub PoC: kaleth4/CVE-2026-33824 (2 stars)
- Write-up: unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/
Verify at the official source NVD · CVE Program · CISA KEV catalog · 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.
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-2026-33824?
windows 10 1607: upgrade to 10.0.14393.9060; windows 10 1809: upgrade to 10.0.17763.8644; windows 10 21h2: upgrade to 10.0.19044.7184. Exact commands for each OS are on this page.
Is CVE-2026-33824 being exploited?
Yes. CVE-2026-33824 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.
What does CVE-2026-33824 affect?
CVE-2026-33824 affects windows 10 1607, windows 10 1809, windows 10 21h2. Severity is critical (CVSS 9.8). Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
How urgent is CVE-2026-33824?
Priority 100/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist
Software pages
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