CVE-2026-97831

Microsoft — Role: DNS Server Information Disclosure Vulnerability

Patch Tuesday

What EVULNABLE says

An EPSS probability of 0.007, and CVSS base score 6.5.

CISA KEV: did not apply
Ransomware: did not apply
Vendor exploitation: did not apply
EPSS: applied
Microsoft Exploitability Index: did not apply
Pre-patch disclosure: did not apply
KEV recency: did not apply
CVSS: applied

Scheduled Maintenance

EVRS11/100

EVRS priorityElevated

Evidence available

6 of 8 signals

CVSS: CVSS base score 6.5
EPSS: 0.7% EPSS probability
CISA KEV: Not currently CISA KEV-listed
Pre-patch disclosure: Not publicly disclosed pre-patch
Vendor exploitation: No confirmed active exploitation
Microsoft Exploitability Index: Exploitation Less Likely
Ransomware: Ransomware association unavailable
CISA KEV listing date: CISA KEV listing date unavailable

Why some signals show no data

CVSS: 6.5
EPSS: 0.007 (53.5th pctl)

NVD ↗Microsoft ↗

The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.

The evidence behind it

Measure	Value	Source	What it means
CVSS base score	6.5	—	How severe the flaw is in itself. It does not say how likely an attack is.
FIRST EPSS	0.007 (53.5th pctl)	FIRST	FIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs.
Actively exploited	Not confirmed	Patch Tuesday	Whether a source of record has confirmed attacks using it in the wild.
Fixed in	windows 10 1607: update to 10.0.14393.9612 or later \| windows 10 1809: update to 10.0.17763.9376 or later \| windows 10 21h2: update to 10.0.19044.7807 or later \| windows 10 22h2: update to 10.0.19045.7807 or later \| windows 11 23h2: update to 10.0.22631.7652 or later \| windows 11 24h2: update to 10.0.26100.9711 or later	NVD	The version(s) the vendor has published as fixed, where NVD records one.
Public exploit module	None known	Metasploit	Module existing is not the same as active exploitation.
EUVD cross-reference	Listed	ENISA EUVD	ENISA's own vulnerability database entry for this CVE, where one exists.

Impacted software or hardware

windows 10 1607 Operating system — < 10.0.14393.9612
windows 10 1809 Operating system — < 10.0.17763.9376
windows 10 21h2 Operating system — < 10.0.19044.7807
windows 10 22h2 Operating system — < 10.0.19045.7807
windows 11 23h2 Operating system — < 10.0.22631.7652
windows 11 24h2 Operating system — < 10.0.26100.9711
windows 11 25h2 Operating system — < 10.0.26200.9711
windows 11 26h1 Operating system — < 10.0.28000.3231

+6 more affected products — see the full list at NVD.

Fixed versions: windows 10 1607: update to 10.0.14393.9612 or later | windows 10 1809: update to 10.0.17763.9376 or later | windows 10 21h2: update to 10.0.19044.7807 or later | windows 10 22h2: update to 10.0.19045.7807 or later | windows 11 23h2: update to 10.0.22631.7652 or later | windows 11 24h2: update to 10.0.26100.9711 or later

Remediation: Apply the vendor patch or guidance: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97831

Remediation basis: External remediation intelligence

ENISA EUVD also lists this CVE at CVSS 6.5 (v3.1), assigned by microsoft. Source: euvd.enisa.europa.eu.

2 days recorded, 2026-10-14 to 2026-10-15

0.73% as of 2026-10-15 (53.4th percentile). FIRST EPSS, recorded daily since this page started tracking it.

2026-10-14 2026-10-15

The primary records

This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.

NVD ↗ Microsoft ↗

Where this sits

CVE-2026-97831 is one of the entries ranked on the priority feed and in this month's Microsoft release.