Security readout for executives and security teams
Plain-English summary
This Windows flaw can let an attacker who already has limited access raise privileges and gain broad control of the device. It is not a remote entry point, but successful abuse could compromise sensitive data, system integrity, and availability.
Executive priority
Treat this as a high-priority remediation item because CISA identifies known exploitation and successful abuse can yield full system impact. Address affected systems promptly, especially shared endpoints and servers where an attacker could first obtain limited execution.
Technical view
CVE-2020-0638 is a local Update Notification Manager elevation-of-privilege vulnerability involving unsafe file handling, categorized as CWE-59. Exploitation requires prior execution with low privileges but no user interaction. Its CVSS 3.1 score is 7.8, with high potential impact to confidentiality, integrity, and availability.
Likely exposure
Exposure applies to the listed Windows 10 releases from versions 1709 through 1909 and specified Windows Server 2019, 1803, and 1903 installations. Systems outside the supplied affected list cannot be assessed from this evidence. Prior code execution on an affected host is required.
Exploitation context
CISA’s Known Exploited Vulnerabilities listing supports that this vulnerability has been exploited in the wild. The supplied evidence does not identify threat actors, attack campaigns, exploit availability, exploitation frequency, or the initial-access methods used before privilege escalation.
Researcher notes
The vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. CWE-59 indicates improper handling of links during file access, but the supplied sources do not provide enough technical detail to establish the precise file operation, affected component path, detection artifacts, or patch identifiers.
Mitigation direction
- Inventory systems running the affected Windows and Windows Server versions.
- Review Microsoft’s advisory for the applicable security update and deployment guidance.
- Prioritize remediation on exposed endpoints and servers where untrusted users or code can execute.
- Restrict unnecessary local execution and privileges while remediation is pending.
Validation and detection
- Match operating-system versions and architectures against the supplied affected-product list.
- Verify applicable update status using Microsoft’s advisory and endpoint-management records.
- Confirm remediated systems no longer report the vendor-specified vulnerable update state.
- Review security telemetry for unexplained privilege elevation from previously low-privileged processes.
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-59: 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-0638 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
- 7.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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-2020-0638 added to CISA KEV
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2022-05-23T00:00:00.000Z: CVE-2020-0638 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0638CVE reference, microsoft · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0638CVE 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.
Improper Link Resolution Before File Access ('Link Following')
Improper Link Resolution Before File Access ('Link Following') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.