Security readout for executives and security teams
Plain-English summary
CVE-2019-0703 is a Windows SMB Server information disclosure vulnerability. It can expose sensitive information over the network when a low-privileged authenticated attacker sends certain requests. The base severity is medium, but CISA lists it in KEV, so organizations should treat unresolved exposure as materially urgent.
Executive priority
Prioritize this above ordinary medium vulnerabilities because CISA KEV confirms exploitation. The business risk is unauthorized disclosure of sensitive information from Windows systems, especially legacy assets and servers reachable over SMB.
Technical view
The vulnerability affects multiple Windows and Windows Server versions and has CVSS 3.1 score 6.5: network attack vector, low complexity, low privileges required, no user interaction, high confidentiality impact, no integrity or availability impact. The provided sources do not describe exploit mechanics.
Likely exposure
Exposure is most likely on listed Windows desktop and server systems running SMB Server, especially where SMB is reachable by authenticated network users. Legacy systems such as Windows 7 and Server 2008 R2 require particular attention.
Exploitation context
CISA KEV status supports known exploitation. The provided bundle does not state exploitation scale, affected campaigns, public proof-of-concept status, or specific attacker behavior. Treat this as confirmed exploited, but avoid assuming weaponization details beyond the cited KEV signal.
Researcher notes
Evidence supports an SMB Server information disclosure issue with authenticated network reachability and high confidentiality impact. The source bundle does not provide CWE mapping, exploit detail, patch identifiers, or detection signatures; validate remediation against MSRC rather than assuming a specific fix.
Mitigation direction
- Review the Microsoft MSRC advisory for affected versions and applicable security updates.
- Prioritize remediation under CISA KEV tracking for internet-exposed or sensitive Windows systems.
- Reduce SMB reachability to trusted network segments until systems are verified remediated.
- Restrict low-privileged accounts that can reach SMB on affected hosts.
- Document exceptions and compensating controls for unsupported or legacy Windows assets.
Validation and detection
- Inventory Windows versions against the affected product list in the CVE bundle.
- Verify installed Windows security updates against Microsoft MSRC guidance for CVE-2019-0703.
- Confirm SMB exposure paths from user networks, VPNs, and untrusted segments.
- Review logs for unusual authenticated SMB access to sensitive Windows systems.
- Track remediation status separately for legacy or unsupported Windows hosts.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2019-0703 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0703CVE reference · x_refsource_CONFIRM
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0703CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.