How severe is CVE-2023-21758?

CVE-2023-21758 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-21758?

Affected package information for CVE-2023-21758 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-21758?

No fixed version has been published for CVE-2023-21758 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-21758 actively exploited in the wild?

No public exploit code has been indexed for CVE-2023-21758 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2023-21758?

CVE-2023-21758 has an EPSS (Exploit Prediction Scoring System) score of 92.5%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2023-21758?

CVE-2023-21758 is classified as NULL Pointer Dereference (CWE-476). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2023-21758?

CVE-2023-21758 affects microsoft windows 10 (5 versions, e.g. 20h2, 21h2, 22h2…); microsoft windows 11 (2 versions, e.g. 21h2, 22h2); microsoft windows server 2016; microsoft windows server 2019, and 1 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2023-21758 published, and has it been updated?

CVE-2023-21758 was published on January 10, 2023 and was last updated on November 21, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2023-21758

HIGH

Windows Internet Key Exchange (IKE) Extension Denial of Service Vulnerability

Published

Jan 10, 2023

Updated

Nov 21, 2024

Affected

0 pkgs

Patched

None yet

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

92.5%probability of exploitation in next 30 days

Very High Risk100th percentile+40.84%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Windows Internet Key Exchange (IKE) Extension Denial of Service Vulnerability

Affected Products

5 products · 15 configurations

windows 10microsoft

5 versions

20h221h222h216071809

windows 11microsoft

2 versions

21h222h2

windows server 2016microsoft

all

windows server 2019microsoft

all

windows server 2022microsoft

all

Frequently Asked Questions

Windows Internet Key Exchange (IKE) Extension Denial of Service Vulnerability

O3 Security · Impact-Aware SCA

Is CVE-2023-21758 in your stack?

O3 detects CVE-2023-21758 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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