LiveActive security incident?Get immediate response
CVE Record

CVE-2021-34506: Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

MediumCVSS 6.1Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-34506 is a medium-severity security feature bypass in Microsoft Edge (Chromium-based). The business risk is mainly user-driven browser exposure: a user would need to interact with attacker-controlled content, and successful impact is limited to confidentiality and integrity, not availability.

Executive priority

Treat this as a normal-priority browser patching issue, not an emergency. It deserves prompt remediation through standard endpoint update processes because browsers are broadly exposed to untrusted content.

Technical view

The supplied CVSS 3.1 vector is 6.1: network attack vector, low complexity, no privileges required, user interaction required, changed scope, low confidentiality and integrity impact, and no availability impact. The public bundle identifies Microsoft Edge (Chromium-based) as affected.

Likely exposure

Exposure is limited to environments running affected Microsoft Edge (Chromium-based) builds. Risk is higher where browser updates are delayed, unmanaged, or inconsistently verified across user workstations.

Exploitation context

The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates exploitation requires user interaction, so likely scenarios involve users reaching attacker-controlled web content.

Researcher notes

Public details in the bundle are sparse: no CWE, no exploit details, and no named mitigation beyond the Microsoft advisory reference. Use the CVSS vector and vendor advisory to drive validation, not assumptions about exploit mechanics.

Mitigation direction

  • Review Microsoft MSRC guidance for CVE-2021-34506 and apply the vendor-recommended Edge update.
  • Confirm Edge auto-update or enterprise browser update management is functioning across endpoints.
  • Prioritize remediation for users with frequent external web and email interaction.
  • Avoid inventing compensating controls; follow Microsoft guidance where details are incomplete.

Validation and detection

  • Inventory Microsoft Edge Chromium-based versions across managed endpoints.
  • Compare deployed versions with Microsoft MSRC guidance for CVE-2021-34506.
  • Confirm patched status through endpoint management or browser update telemetry.
  • Check vulnerability scanners for authenticated browser-version detection coverage.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CVE-2021-34506 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
6.1CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C2.82.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.1Medium
CVSS 3.1 vector shape for CVE-2021-34506Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MicrosoftMicrosoft Edge (Chromium-based)1.0.0Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.