CVE-2026-50722: IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload

highCVSS 8.1CVE-2026-50722

CSIRTS triage

Denial of service

What: The vulnerability allows for denial of service via a specific RSA-SHA1 authentication payload.
Who is affected: Systems using IKEv2 are affected.
Urgency: Remediation is high urgency due to the severity of the denial of service risk.
Action: Apply patches or mitigations as soon as they are available.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.1
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50722

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-2026-507220.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50722	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for IKEv2 Denial of

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-12413: IKEv2 Denial of Service via malformed fragmentationmsrc · 2026-07-14
highCVE-2026-12413: An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. …nvd · 2026-07-02