Security readout for executives and security teams
Plain-English summary
CVE-2025-21338 is a Microsoft GDI+ remote code execution vulnerability affecting listed Windows and Office variants. Successful exploitation could let an attacker run code and compromise confidentiality, integrity, and availability. The supplied evidence rates it high severity, but does not show active exploitation.
Executive priority
Treat this as a high-priority Microsoft patching item, especially for broad endpoint fleets. No active exploitation is evidenced here, but potential full system impact justifies prompt remediation through normal emergency patch governance.
Technical view
The bundle identifies a GDI+ RCE issue with CWE-190 integer overflow and CVSS 3.1 score 7.8. The vector is AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating local access, low complexity, low privileges, and no user interaction.
Likely exposure
Organizations may be exposed if they run the listed Windows 10/11, Windows Server, or Microsoft Office Android, iOS, Mac, Universal, or LTSC builds. Exposure is asset-version dependent; the bundle provides product families and baseline versions, not full patch-state details.
Exploitation context
The provided bundle does not support active exploitation: KEV is false and CVSS exploit maturity is unproven. Despite the RCE title, the supplied CVSS vector shows local attack requirements with low privileges and no user interaction.
Researcher notes
Evidence is limited to the CVE bundle, CVE records, and MSRC advisory reference. The bundle does not include exploit details, KB identifiers, or proof-of-concept status. Avoid assuming network reachability because the supplied CVSS vector is local.
Mitigation direction
- Apply Microsoft security updates from the MSRC advisory for affected products.
- Prioritize endpoint, server, and Office fleets matching the affected product list.
- Check Microsoft guidance for exact KBs, builds, and platform-specific update paths.
- Retire or isolate unsupported systems that cannot receive applicable Microsoft updates.
Validation and detection
- Inventory Windows and Office versions across managed endpoints, servers, and mobile devices.
- Compare discovered versions against the MSRC advisory and CVE affected-product list.
- Verify that applicable Microsoft security updates are installed successfully.
- Confirm vulnerability scanner findings for CVE-2025-21338 are resolved after patching.
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-190: 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-2025-21338 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
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
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.
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:H/E:U/RL:O/RC:C1.85.9microsoftVulnerability 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/E:U/RL:O/RC:C
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.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- GDI+ Remote Code Execution VulnerabilityCVE reference, microsoft · vendor-advisory, patch
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.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.