CVE-2018-8440

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2022-03-28. Federal remediation due 2022-04-18.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

18.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 97.0% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2018-09-13 00:00Z7 YR AGO

Last updated

2025-10-21 23:45Z10 MO AGO

Reserved

2018-03-14

Assigning CNA

microsoft

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

No CWE assigned

Data version

5.1

Document digest

32ce808124146b3e68cc06c92fe68dfc1cf5ee0454b2f8a1e089dfc70c2b30ea

• portal.msrc.microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8440x_refsource_CONFIRM
• blog.0patch.comhttps://blog.0patch.com/2018/09/comparing-our-micropatch-with.htmlx_refsource_MISC
• blog.0patch.comhttps://blog.0patch.com/2018/08/how-we-micropatched-publicly-dropped.htmlx_refsource_MISC
• www.securitytracker.com1041578http://www.securitytracker.com/id/1041578vdb-entryx_refsource_SECTRACK
• www.securityfocus.com105153http://www.securityfocus.com/bid/105153vdb-entryx_refsource_BID
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8440government-resource