Security readout for executives and security teams
Plain-English summary
A flaw in affected .NET and Visual Studio releases can allow a remote, unauthenticated attacker to disrupt service availability. The supplied record rates it 7.5 High. It does not indicate data theft or modification, but outages could affect customer-facing or business-critical applications.
Executive priority
Address promptly through the normal high-severity patch cycle, accelerating remediation for internet-facing or operationally critical services. The primary business risk is service disruption rather than compromise of sensitive data. Escalate if monitoring shows unexplained crashes or if Microsoft reports active exploitation.
Technical view
CVE-2024-21404 is a network-reachable, low-complexity denial-of-service vulnerability requiring neither privileges nor user interaction. It is classified as CWE-476, indicating a null-pointer dereference. The CVSS vector assigns high availability impact and no confidentiality or integrity impact. The bundle provides no further trigger or component details.
Likely exposure
Potential exposure includes systems using the listed .NET 6.0, 7.0, or 8.0 versions and Visual Studio 2022 versions 17.4, 17.6, or 17.8. Prioritize internet-facing and availability-sensitive .NET services. The supplied version data is limited and should be confirmed against Microsoft’s advisory.
Exploitation context
The CVSS temporal metric reports proof-of-concept exploit maturity. However, the CVE is not listed as KEV in the supplied bundle, and no cited source establishes active exploitation. Treat practical exploitation as plausible but not confirmed in the wild.
Researcher notes
The available evidence supports remote denial of service through a CWE-476 condition, but it does not identify the affected subsystem, malformed input, or reliable detection indicators. Avoid assuming every application on a listed runtime is directly reachable. Use Microsoft’s advisory to establish precise applicability and corrected builds.
Mitigation direction
- Review Microsoft’s CVE advisory for applicable updates and exact fixed versions.
- Update affected .NET runtimes, SDKs, and Visual Studio installations according to Microsoft guidance.
- Prioritize externally reachable and business-critical .NET services.
- Apply Microsoft-recommended mitigations if immediate updating is unavailable.
Validation and detection
- Inventory installed .NET runtimes, SDKs, and Visual Studio versions.
- Map affected runtimes to deployed applications and externally reachable services.
- Confirm installed update levels against Microsoft’s CVE advisory.
- Verify patched services restart successfully and pass availability checks.
- Monitor affected services for unusual crashes, restarts, or availability degradation.
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-476: 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-2024-21404 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/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.
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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C3.93.6microsoftVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/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
- .NET Denial of Service 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.
CWE mapping pending import
This CVE carries a CWE mapping that will resolve to a full Glexia CWE intelligence page after the official CWE import is complete.