Security readout for executives and security teams
Plain-English summary
CVE-2021-31949 is a high-severity Microsoft Outlook remote code execution issue. It matters because successful exploitation could let an attacker run code in the context of a user after required user interaction. The source bundle does not show confirmed active exploitation.
Executive priority
Treat as a normal high-priority endpoint patching item, especially for organizations heavily using Outlook. The business risk is meaningful because code execution can affect data confidentiality and integrity, but supplied evidence does not support emergency active-exploitation handling.
Technical view
The CVSS 3.1 score is 7.3 with local attack vector, low complexity, no privileges required, and required user interaction. Impact is high for confidentiality and integrity and low for availability. The listed weakness is CWE-94, code generation/control injection.
Likely exposure
Exposure is likely on endpoints running the affected Microsoft Outlook or Office products listed: Outlook 2013 SP1, Outlook 2016, Office 2019, and Microsoft 365 Apps for Enterprise versions identified in the bundle.
Exploitation context
The bundle marks KEV as false and the CVSS exploit maturity as unproven. Do not treat this as actively exploited based on the supplied evidence. User interaction is required, so phishing or malicious content delivery would be a plausible concern, but the bundle provides no exploit details.
Researcher notes
Source detail is limited to the CVE record, CVSS vector, affected products, CWE-94, KEV=false, and MSRC advisory link. No exploit path, proof of concept, or specific patch identifiers are included in the provided bundle.
Mitigation direction
- Review Microsoft’s MSRC advisory for CVE-2021-31949.
- Apply the official Microsoft security updates for affected Office and Outlook versions.
- Prioritize managed desktops and VDI images with Outlook installed.
- Restrict risky mail content handling where existing email security controls support it.
- Check vendor guidance if product build coverage is unclear.
Validation and detection
- Inventory installed Outlook and Office versions across endpoints.
- Match versions against the affected products in the source bundle.
- Confirm Microsoft security updates for CVE-2021-31949 are installed.
- Verify high-risk user groups are included in patch compliance reporting.
- Review email security detections for suspicious Office or Outlook content.
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-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. 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-2021-31949 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
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/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.
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:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C1.85.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31949CVE reference · x_refsource_MISC
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 Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.