CVSS—
Severityhigh
Weakness—
EPSS99.2%99.9th percentile
Exploited3 KEV sources
Ransomware useKnown
Federal fix dueAug 10, 2022
patch window
Called exploited 329 days before disclosure.
Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.
The life of this vulnerability
- CVE published
- First KEV listing11mo
- Last KEV listing5.8y
- Last sighting4.4y
Gaps are compressed to equal steps. The elapsed time is printed under each.
Which catalogues call it exploited
- CISA KEVUS federallisted Feb 10, 2022
- EUVDENISA, European Unionlisted Feb 10, 2022
- VulnCheck KEVcommercial researchlisted Apr 22, 2016
- CIRCLaggregator, mirrors the abovelisted Feb 10, 2022, not counted
Sources3 of 3
Listings differ by2120 d
Strongest claimconfirmed
3 catalogues list it. CIRCL aggregates the others and is shown but not counted.
Public exploitation evidence
- reported exploitationdownloads.breachlock.com/hubfs/BreachLock%20Marketing/Breach
- reported exploitationwww.loginsoft.com/reports/annually/vulnerability-intelligenc
- reported exploitationweb-assets.esetstatic.com/wls/en/papers/threat-reports/eset-
- reported exploitationwww.enisa.europa.eu/sites/default/files/2025-10/ENISA%20Thre
- reported exploitationwww.dexpose.io/threat-actor-profile-apt27/
- reported exploitationmedium.com/@nshcthreatrecon/trend-report-of-ransomware-activ
74 public reports collected from VulnCheck and CIRCL, first on Apr 22, 2016. Each links to its original source. We have not verified them.
Description
The SMBv1 server in multiple Microsoft Windows versions allows remote attackers to execute arbitrary code via crafted packets.
Required action (CISA)
Apply updates per vendor instructions.
