Security readout for executives and security teams
Plain-English summary
CVE-2021-1705 is a memory corruption issue in the HTML-based Microsoft Edge browser. A successful attack would require user interaction and has high attack complexity. Reported impact is limited confidentiality and integrity loss, with no availability impact in the supplied CVSS data.
Executive priority
Treat this as a moderate legacy-browser risk. It does not show active exploitation in the supplied sources, but user-driven browser memory corruption can still create business exposure where legacy EdgeHTML remains deployed.
Technical view
The supplied CVSS 3.1 vector is 4.2: network attack vector, high complexity, no privileges, user interaction required, unchanged scope, low confidentiality and integrity impact, and no availability impact. The affected product listed is Microsoft Edge (EdgeHTML-based).
Likely exposure
Exposure is likely limited to environments still running Microsoft Edge (EdgeHTML-based). The bundle does not identify Chromium-based Edge, other browsers, or operating-system components as affected, so do not expand scope without vendor confirmation.
Exploitation context
The bundle marks KEV as false, so there is no provided evidence of known active exploitation. The CVSS temporal metric includes E:P, indicating proof-of-concept exploit maturity, but the sources do not provide exploit details.
Researcher notes
Evidence is sparse beyond Microsoft and CVE metadata. Validate exposure against EdgeHTML-based Edge only, preserve the user-interaction and high-complexity constraints, and avoid assuming broader Microsoft Edge impact without additional vendor data.
Mitigation direction
- Review Microsoft’s CVE-2021-1705 guidance and apply the official update if applicable.
- Inventory endpoints for Microsoft Edge (EdgeHTML-based) presence.
- Remove or retire EdgeHTML-based Edge where business use is no longer required.
- Prioritize remediation where users browse untrusted web content.
Validation and detection
- Confirm whether EdgeHTML-based Microsoft Edge exists in the asset inventory.
- Verify Microsoft’s CVE-2021-1705 update status on affected endpoints.
- Check vulnerability management results against the exact affected product listed.
- Document any compensating controls if vendor remediation is not yet applied.
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.
CVE-2021-1705 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
- Medium
- CVSS
- 4.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/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:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C1.62.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.2MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Edge (HTML-based) Memory Corruption VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1705CVE reference · x_refsource_MISC, x_transferred
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.