An information disclosure vulnerability exists in the way that the Windows SMB Server handles certain requests, aka 'Windows SMB Information Disclosure Vulnerability'. This CVE ID is unique from CVE-2019-0704, CVE-2019-0821.
CVE-2019-0703
MEDIUMNVD 6.59.0▲Exploited in the wild
EchelonGraph scoreHIGH confidence
Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.5 retained for reference. Confidence: HIGH.
Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
6.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
- Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 10%CVSS: 6.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 9.0(high)
- EPSS
- 94.9%
- KEV
- ⚠ Exploited
Published
April 9, 2019
Last Modified
October 29, 2025
Advisory Details (2)
Auto-updated Jun 12, 2026⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
cisa Patch Available🔴 Active Exploitation
Known Exploited Vulnerabilities Catalog | CISA
Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0703microsoft Patch Available
Security Update Guide - Microsoft Security Response Center
Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0703All Vendor Advisories
(1)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Frequently asked(6)
What is CVE-2019-0703?
CVE-2019-0703 is a medium vulnerability published on April 9, 2019. An information disclosure vulnerability exists in the way that the Windows SMB Server handles certain requests, aka 'Windows SMB Information Disclosure Vulnerability'. This CVE ID is unique from CVE-2019-0704, CVE-2019-0821.
When was CVE-2019-0703 disclosed?
CVE-2019-0703 was first published in the National Vulnerability Database on April 9, 2019, with the most recent update on October 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-0703 actively exploited?
Yes. CISA added CVE-2019-0703 to the Known Exploited Vulnerabilities catalog on May 23, 2022, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2019-0703?
CVE-2019-0703 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2019-0703?
CVE-2019-0703 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2019-0703?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-0703, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2019-0703
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