CVE-2026-12413: IKEv2 Denial of Service via malformed fragmentation
CSIRTS triage
- What
- Denial of service can occur via malformed fragmentation.
- Who is affected
- Deployments using IKEv2.
- Urgency
- Remediation is urgent due to high severity and potential for exploitation.
- Action
- Apply any available patches or mitigations.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-12413
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-124130.60% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-12413 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[NEW] [medium] Red Hat Enterprise Linux (libreswan): Multiple vulnerabilities allow Denial of Servicecert-bund
- unknownMultiple vulnerabilities in Microsoft Azure Linux (July 10, 2026)cert-fr-avis
- highCVE-2026-12413: An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. …nvd
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