CVE-2026-41637: Degradation of resolution service from improperly accounted client-terminated DNS-over-QUIC queries

lowCVSS 3.7CVE-2026-41637

CSIRTS triage

vendor: null product: nullOther

What: Degradation of resolution service can occur from improperly accounted client-terminated DNS-over-QUIC queries.
Who is affected: Systems using DNS-over-QUIC are affected.
Urgency: Remediation is low urgency as the impact is limited.
Action: Monitor DNS-over-QUIC query handling.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: low — CVSS 3.7
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41637

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-2026-416370.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-41637	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 Degradation of resolution

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.

mediumCVE-2026-56444: Degradation of resolution service when 'discard-timeout' and 'serve-expired-client-timeout' ar…msrc · 2026-07-14