CVE-2026-33824: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 18 Aug 2026, 126 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 77.1%
EPSS score, percentile 99.5 of all scored records
- How severe?
- 9.8 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline 21 Aug 2026. Apply mitigations in accordance with vendor instructions … Full text
- Which versions are affected?
Affected
- from 10.0.14393.0 to before 10.0.14393.9060
- from 10.0.17763.0 to before 10.0.17763.8644
- from 10.0.19044.0 to before 10.0.19044.7184
- from 10.0.19045.0 to before 10.0.19045.7184
- from 10.0.22631.0 to before 10.0.22631.6936
- from 10.0.22631.0 to before 10.0.22631.6936
and 11 more in the table below
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA due date for this action: 21 August 2026.
Advisories and patches
Linked from CISA's catalog entry
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-33824
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-33824
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 10.0.14393.0 to before 10.0.14393.9060 |
| Status | Versions |
|---|---|
| Affected | from 10.0.17763.0 to before 10.0.17763.8644 |
| Status | Versions |
|---|---|
| Affected | from 10.0.19044.0 to before 10.0.19044.7184 |
| Status | Versions |
|---|---|
| Affected | from 10.0.19045.0 to before 10.0.19045.7184 |
| Status | Versions |
|---|---|
| Affected | from 10.0.22631.0 to before 10.0.22631.6936 |
| Status | Versions |
|---|---|
| Affected | from 10.0.22631.0 to before 10.0.22631.6936 |
| Status | Versions |
|---|---|
| Affected | from 10.0.26100.0 to before 10.0.26100.8246 |
| Status | Versions |
|---|---|
| Affected | from 10.0.26200.0 to before 10.0.26200.8246 |
| Status | Versions |
|---|---|
| Affected | from 10.0.28000.0 to before 10.0.28000.1836 |
| Status | Versions |
|---|---|
| Affected | from 10.0.14393.0 to before 10.0.14393.9060 |
| Status | Versions |
|---|---|
| Affected | from 10.0.14393.0 to before 10.0.14393.9060 |
| Status | Versions |
|---|---|
| Affected | from 10.0.17763.0 to before 10.0.17763.8644 |
| Status | Versions |
|---|---|
| Affected | from 10.0.17763.0 to before 10.0.17763.8644 |
| Status | Versions |
|---|---|
| Affected | from 10.0.20348.0 to before 10.0.20348.5020 |
| Status | Versions |
|---|---|
| Affected | from 10.0.25398.0 to before 10.0.25398.2274 |
| Status | Versions |
|---|---|
| Affected | from 10.0.26100.0 to before 10.0.26100.32690 |
| Status | Versions |
|---|---|
| Affected | from 10.0.26100.0 to before 10.0.26100.32690 |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Microsoft Internet Key Exchange (IKE) Service Extensions contains a double free vulnerability that could enable remote code execution.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2026-33824 to its Known Exploited Vulnerabilities (KEV) catalog on 18 Aug 2026.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 21 Aug 2026.
- The CVE record was published on 14 Apr 2026, 126 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 77.1% (percentile 99.5), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-415: Double Free
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 14 Apr 2026 | CVE record published |
| 18 Aug 2026 | Added to CISA KEV |
| 21 Aug 2026 | CISA due date for the required action |
| 15 Oct 2026 | CVE record last updated |
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