CVE-2026-33824: Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability

What it is

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

Description quoted from the CVE record (assigned by microsoft, published 2026-04-14).

Weakness: CWE-415: Double Free

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. 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

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: total.

On CISA KEV since

2026-08-18

US federal deadline

2026-08-21

Ransomware use

Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2026-05343, EUVD-2026-22641, GHSA-q6qf-3m2m-xq4f

Exploit Observer links 2 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (2)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

• Code repository: https://github.com/kaleth4/cve-2026-33824
• Code repository: https://github.com/z3r0h3ro/cve-2026-33824

Vulnerability databases and vendor advisories (7)

Catalogue entries, not exploit evidence.

• Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-22641
• Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-q6qf-3m2m-xq4f
• Vulnerability database or vendor advisory: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-33824
• Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-33824
• Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33824
• Vulnerability database or vendor advisory: https://www.vicarius.io/vsociety/posts/cve-2026-33824-detection-script-windows-ike-service-extensions-rce
• Vulnerability database or vendor advisory: https://www.vicarius.io/vsociety/posts/cve-2026-33824-mitigation-script-windows-ike-service-extensions-rce

7 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS

0.771
very likely to be attacked soon

VEDAS

0.924
strong exploit evidence

On CISA KEV

Yes, since 2026-08-18

Detection rule

None yet

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish. The vertical line is the day CISA added it to its exploited list.

Who is affected

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: microsoft windows_10_1607, microsoft windows_10_1809, microsoft windows_10_21h2, microsoft windows_10_22h2, microsoft windows_11_23h2, microsoft windows_11_24h2, microsoft windows_11_25h2, microsoft windows_11_26h1, microsoft windows_server_2016, microsoft windows_server_2019.

How to fix it

Fixed versions stated in the CVE record: 10.0.14393.9060, 10.0.17763.8644, 10.0.19044.7184, 10.0.19045.7184, 10.0.22631.6936, 10.0.26100.8246, 10.0.26200.8246, 10.0.28000.1836, 10.0.20348.5020, 10.0.25398.2274, 10.0.26100.32690.

CISA required action: 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.

Vendor guidance:

• Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability (vendor-advisory, patch)

How to detect it

There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.

References

Vendor advisories and patches

• Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability (vendor-advisory, patch)

Exploits and technical analysis

• https://unit42.paloaltonetworks.com/autonomous-ai-cyber-attack-campaign/ (third-party-advisory)

Government sources

• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33824 (government-resource)

Other databases

• CVE record (cve.org)
• NVD
• Exploit Observer

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.