VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished CVSS 9.8 criticalEPSS 0.8% probability of exploitation in 30 days
Microsoft
CVE-2026-83869: Windows Domain Name Service Remote Code Execution Vulnerability
Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
How likely is exploitation in the next 30 days?
0.8%
Up from 0.6% on .
EPSS score, percentile 57.1 of all scored records. A probability estimated by FIRST, not a report of exploitation.
How severe?
9.8Critical
CVSS v3.1 base score, given by the CNA
What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
Integer underflow (wrap or wraparound) in DNS Server allows an unauthorized attacker to execute code over a network.
Summary: CVE record, as of .
CISA has not added CVE-2026-83869 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
The CVE record was published on 13 Oct 2026.
The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), given by its CNA.
FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.8% (percentile 57.1), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
CISA's SSVC assessment in the CVE record: exploitation none, automatable yes, technical impact total.
Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.
Description
Windows Domain Name Service Remote Code Execution Vulnerability
Integer underflow (wrap or wraparound) in DNS Server allows an unauthorized attacker to execute code over a network.