Security readout for executives and security teams
Plain-English summary
This is a high-severity Microsoft Edge Chromium-based security feature bypass. A successful attack could affect confidentiality, integrity, and availability, but the CVSS vector requires user interaction. The supplied sources do not show active exploitation or CISA KEV listing.
Executive priority
Treat as a high-priority browser patching item, especially for user endpoints exposed to untrusted web content. Urgency is moderated by no supplied active-exploitation evidence, but the potential impact is high.
Technical view
CVE-2021-31982 is classified as CWE-693, Protection Mechanism Failure. CVSS 3.1 is 8.8 with network attack vector, low complexity, no privileges required, user interaction required, unchanged scope, and high CIA impact. Microsoft lists official remediation availability.
Likely exposure
Exposure is limited to Microsoft Edge Chromium-based deployments matching Microsoft’s affected guidance. The supplied affected-version detail is sparse, so teams should verify installed Edge versions against MSRC rather than assuming all builds are affected.
Exploitation context
The bundle marks KEV as false and provides no source showing active exploitation. CVSS indicates exploitation would be remote and low-complexity but requires a user action, likely reducing wormable risk while preserving phishing or web-content exposure concerns.
Researcher notes
Available evidence is limited to CVE and MSRC metadata. The issue is a security feature bypass under CWE-693, with official remediation listed and exploit maturity marked unproven. Do not infer exploit technique from the title alone.
Mitigation direction
- Apply Microsoft’s official Edge security update from the MSRC advisory.
- Confirm Edge auto-update is enabled across managed endpoints.
- Prioritize browsers on internet-facing user workstations and privileged-admin devices.
- Check vendor guidance for any compensating controls or version-specific notes.
Validation and detection
- Inventory Microsoft Edge Chromium-based versions across endpoints.
- Compare installed versions with the MSRC CVE-2021-31982 advisory.
- Review endpoint vulnerability scanner findings for this CVE.
- Confirm updated systems no longer report CVE-2021-31982 exposure.
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-693: 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 lookupCVE-2021-31982 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.
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:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Edge (Chromium-based) Security Feature Bypass VulnerabilityCVE reference · vendor-advisory
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.
Protection Mechanism Failure
Protection Mechanism Failure represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.