How severe is CVE-2017-0143?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2017-0143 known to be exploited?

Yes. CVE-2017-0143 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 221 public proof-of-concept repositories are indexed.

Vulnerability in Microsoft Server Message Block

CVE-2017-0143

The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607; and Windows Server 2016 allows remote attackers to execute arbitrary code via crafted packets, aka "Windows SMB Remote Code Execution Vulnerability." This vulnerability is different from those described in CVE-2017-0144, CVE-2017-0145, CVE-2017-0146, and CVE-2017-0148.

Published 2017-03-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.933 (99.8th percentile), scored 2026-10-15.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.933 · newest: 0.933 · change: 0.000

Affected products

Microsoft Server Message Block — versions 1.0
Microsoft Windows 10 1507
Microsoft Windows 10 1511
Microsoft Windows 10 1607
Microsoft Windows 7
Microsoft Windows 8.1
Microsoft Windows Rt 8.1
Microsoft Windows Server 2008 — versions r2
Microsoft Windows Server 2012 — versions r2
Microsoft Windows Server 2016

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

www.exploit-db.com/exploits/41891/ (Exploit, VDB Entry, Third Party Advisory, exploit)
www.securityfocus.com/bid/96703 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www.securitytracker.com/id/1037991 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
cert-portal.siemens.com/productcert/pdf/ssa-701903.pdf (Third Party Advisory)
ics-cert.us-cert.gov/advisories/ICSMA-18-058-02 (US Government Resource, Third Party Advisory)
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0143 (Patch, Vendor Advisory)
www.exploit-db.com/exploits/41987/ (Exploit, VDB Entry, Third Party Advisory, exploit)
cert-portal.siemens.com/productcert/pdf/ssa-966341.pdf (Third Party Advisory)
www.exploit-db.com/exploits/43970/ (Exploit, VDB Entry, Third Party Advisory, exploit)
packetstormsecurity.com/files/154690/DOUBLEPULSAR-Payload-Execution-Neutralizat… (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2017-0143?: CVE-2017-0143 is a high-severity vulnerability in Microsoft Server Message Block. CVSS score: 8.8/10. Published 2017-03-17.
How severe is CVE-2017-0143?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2017-0143 known to be exploited?: Yes. CVE-2017-0143 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 221 public proof-of-concept repositories are indexed.