Security readout for executives and security teams
Plain-English summary
McAfee Web Gateway scanning proxies before 7.8.2.13 can be remotely disrupted, causing denial of service. The sources describe availability impact only, not data theft or tampering. There is no KEV listing or provided evidence of active exploitation.
Executive priority
Treat as a medium-priority availability risk. Patch during the next standard security maintenance window, sooner for externally exposed or mission-critical gateway services.
Technical view
CVE-2019-3643 affects McAfee Web Gateway scanning proxies earlier than 7.8.2.13. A remote unauthenticated attacker exploiting CVE-2019-9511 may cause denial of service. CVSS 3.1 is 5.3, network attack vector, low complexity, no privileges or user interaction, and low availability impact.
Likely exposure
Exposure is limited to organizations running McAfee Web Gateway scanning proxy components earlier than 7.8.2.13. Internet-facing or broadly reachable proxy deployments carry higher operational risk.
Exploitation context
The vulnerability is remotely reachable and unauthenticated, but the documented impact is denial of service. The source bundle does not cite public exploitation, and CISA KEV status is false.
Researcher notes
The bundle links this MWG issue to CVE-2019-9511 but provides limited implementation detail. No CWE is listed. Avoid assuming broader HTTP/2 exposure or affected products beyond McAfee Web Gateway scanning proxies.
Mitigation direction
- Upgrade McAfee Web Gateway to 7.8.2.13 or later per vendor guidance.
- Review McAfee advisory SB10296 for the official remediation path.
- Prioritize externally reachable or business-critical scanning proxies.
- Monitor vendor channels for any later guidance or replacement advisories.
Validation and detection
- Inventory McAfee Web Gateway deployments and confirm running versions.
- Identify which deployments operate scanning proxy components.
- Check whether any MWG instances are reachable from untrusted networks.
- Review availability logs for unexplained proxy crashes or service degradation.
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-2019-3643 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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.
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:N/UI:N/S:U/C:N/I:N/A:L3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://kc.mcafee.com/corporate/index?page=content&id=SB10296CVE reference · x_refsource_CONFIRM
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.