CVE-2026-33824
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
Critical
Known exploited
- Severity
- 9.8 / 10
- Critical · CVSS 3.1
- Exploit chance (EPSS)
- 77.05%
- Chance of exploitation in the next 30 days. Higher than 99.55% of scored vulnerabilities.
- Known exploited
- Yes
- In CISA's catalog since Aug 18, 2026
- Weakness
- CWE-415 Double Free
- Fix
- None yet
- No fixed version published
Exploited in the wild. Microsoft Internet Key Exchange (IKE) Service Extensions Double Free Vulnerability (Microsoft Internet Key Exchange (IKE) Service Extensions). 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. Due for U.S. federal agencies by Aug 21, 2026.
Description
Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.
How to fix
No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.
Severity breakdown
CVSS 3.1 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Weakness
CWE-415: Double Free
The product calls free() twice on the same memory address.
How to prevent it
- Architecture and Design: Choose a language that provides automatic memory management.
- Implementation: Ensure that each allocation is freed only once. After freeing a chunk, set the pointer to NULL to ensure the pointer cannot be freed again. In complicated error conditions, be sure that clean-up routines respect the state of allocation properly. If the language is object oriented, ensure that object destructors delete each chunk of memory only once.
- Implementation: Use a static analysis tool to find double free instances.
References
Advisories
Other links
Timeline
- Published
- Added to CISA's Known Exploited Vulnerabilities catalog
- Remediation due for U.S. federal agencies
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GO-2026-4981 Crash when handling long CNAME response in net | High | Same weakness, CWE-415 |
| GHSA-vfvv-c25p-m7mm rkyv: Panic safety bugs in `InlineVec::clear` and `SerVec::clear` enable arbitrary code execution | Medium | Same weakness, CWE-415 |
| CVE-2025-62215 Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Kernel allows an authorized attacker to elevate… | High Known exploited | Same weakness, CWE-415 |
| GHSA-7mcq-f592-pf7v Slice Ring Buffer and Slice Deque contains four unique double-free vulnerabilities triggered through safe APIs | High | Same weakness, CWE-415 |
| GHSA-pg9f-39pc-qf8g crossbeam-channel Vulnerable to Double Free on Drop | Medium | Same weakness, CWE-415 |
| GHSA-f49c-87jh-g47q TensorFlow has double free in Fractional(Max/Avg)Pool | High | Same weakness, CWE-415 |
| GHSA-v5w6-wcm8-jm4q openssl-src contains Double free after calling `PEM_read_bio_ex` | High | Same weakness, CWE-415 |
| CVE-2021-22600 A double free bug in packet_set_ring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny… | High Known exploited | Same weakness, CWE-415 |
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