Secuno
ENNL
Book demo

CVE-2026-33824

Microsoft Internet Key Exchange (IKE) Service Extensions Double Free

9.8 CRITICALActively exploited (CISA KEV)EPSS 1.62%
  1. Published14 Apr 2026
  2. Added to CISA KEV18 Aug 2026
  3. Remediation due21 Aug 2026
Actively exploited (CISA KEV)

Microsoft Internet Key Exchange (IKE) Service Extensions contains a double free vulnerability that could enable remote code execution.

Added to KEV: 18 Aug 2026Federal remediation due: 21 Aug 2026

Description

Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 1607< 10.0.14393.9060
Microsoft Windows 10 1809< 10.0.17763.8644
Microsoft Windows 10 21h2< 10.0.19044.7184
Microsoft Windows 10 22h2< 10.0.19045.7184
Microsoft Windows 11 23h2< 10.0.22631.6936
Microsoft Windows 11 24h2< 10.0.26100.8246
Microsoft Windows 11 25h2< 10.0.26200.8246
Microsoft Windows 11 26h1< 10.0.28000.1836
Microsoft Windows Server 2016< 10.0.14393.9060
Microsoft Windows Server 2019< 10.0.17763.8644
Microsoft Windows Server 2022< 10.0.20348.5020
Microsoft Windows Server 2022 23h2< 10.0.25398.2274
Microsoft Windows Server 2025< 10.0.26100.32690

Remediation

Fixed in
Microsoft Windows 10 1607≥ 10.0.14393.9060
Microsoft Windows 10 1809≥ 10.0.17763.8644
Microsoft Windows 10 21h2≥ 10.0.19044.7184
Microsoft Windows 10 22h2≥ 10.0.19045.7184
Microsoft Windows 11 23h2≥ 10.0.22631.6936
Microsoft Windows 11 24h2≥ 10.0.26100.8246
Microsoft Windows 11 25h2≥ 10.0.26200.8246
Microsoft Windows 11 26h1≥ 10.0.28000.1836
Microsoft Windows Server 2016≥ 10.0.14393.9060
Microsoft Windows Server 2019≥ 10.0.17763.8644

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-57599.8
A double free and use-after-free vulnerability in the RdbLoadDeletedNodes function of…
CVE-2026-890789.9
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.2 before…
CVE-2026-910188.8
lwIP (Lightweight IP) has a double free vulnerability, which could crash the system,…
CVE-2026-201358.6
A vulnerability in the TLS 1.3 implementation in Cisco Secure Firewall Threat Defense…
CVE-2026-845619.8
A double free issue was addressed with improved memory management. This issue is fixed…
CVE-2026-859218.2
Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate…

Frequently asked

Is CVE-2026-33824 being actively exploited?

Yes. CVE-2026-33824 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 18 Aug 2026.

How severe is CVE-2026-33824?

CVE-2026-33824 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.62% probability of exploitation.

Which products are affected by CVE-2026-33824?

Affected products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, and 8 more.

How do I fix CVE-2026-33824?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1607 10.0.14393.9060, Microsoft Windows 10 1809 10.0.17763.8644, Microsoft Windows 10 21h2 10.0.19044.7184 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33824 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.