Security readout for executives and security teams
Plain-English summary
CVE-2018-8174 is a Windows VBScript memory-corruption flaw that can let an attacker run code after a user interacts with malicious network-delivered content. Successful exploitation could compromise data, alter systems, or disrupt operations. CISA lists it as known exploited, making unsupported or unpatched affected Windows systems a priority.
Executive priority
Treat this as a high-priority legacy Windows remediation issue. Known exploitation and public exploit material increase urgency. Require owners to identify affected assets, confirm Microsoft-directed remediation, and isolate or retire systems that cannot be updated.
Technical view
The VBScript engine improperly handles objects in memory, categorized as CWE-787. The supplied CVSS 3.1 score is 7.5: exploitation is network-accessible, requires no privileges, requires user interaction, and has high confidentiality, integrity, and availability impact. The source bundle does not establish the exact exploitation path for every affected configuration.
Likely exposure
Exposure includes the listed Windows 7, 8.1, RT 8.1, Windows 10, and Windows Server 2008 through 2016 variants. Prioritize systems still running these legacy releases, particularly endpoints processing untrusted content. Inventory and patch status are required to determine actual exposure.
Exploitation context
CISA's Known Exploited Vulnerabilities listing supports that CVE-2018-8174 has been exploited in the wild. Exploit-DB also references public exploit material. The supplied CVSS vector indicates user interaction and high attack complexity, but neither condition makes exposed, unpatched systems safe.
Researcher notes
The supplied evidence supports memory corruption, remote code execution impact, required user interaction, known exploitation, and public exploit availability. It does not provide specific KB identifiers, detailed indicators of compromise, exploitation prevalence, or configuration-specific reachability. Consult Microsoft and CISA records before making version-level remediation decisions.
Mitigation direction
- Review Microsoft's CVE guidance and deploy the applicable security update for each affected Windows version.
- Prioritize unsupported or internet-facing affected systems for isolation, upgrade, or retirement.
- Restrict untrusted content and legacy scripting exposure until remediation is confirmed.
- Use compensating controls recommended by Microsoft if immediate patching is operationally impossible.
Validation and detection
- Inventory systems against the affected Windows versions and editions listed in the CVE record.
- Verify applicable Microsoft security updates are installed using trusted patch-management records.
- Confirm unsupported systems have documented isolation, upgrade, or retirement plans.
- Review endpoint and network telemetry for suspicious VBScript-related activity and unexpected child processes.
- Retest representative systems after remediation without using public exploit code in production.
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.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-8174 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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
SSVC decision data
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:H/PR:N/UI:R/S:U/C:H/I:H/A:H1.65.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2018-8174 added to CISA KEV
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2022-02-15T00:00:00.000Z: CVE-2018-8174 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- 44741CVE reference, microsoft · exploit, x_refsource_EXPLOIT-DB
- https://blog.0patch.com/2018/05/a-single-instruction-micropatch-for.htmlCVE reference, microsoft · x_refsource_MISC
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8174CVE reference, microsoft · x_refsource_CONFIRM
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8174CVE reference, CISA-ADP · 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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.