Security readout for executives and security teams
Plain-English summary
CVE-2021-24080 is a Microsoft Windows Trust Verification API denial-of-service issue. A successful attack could disrupt availability on affected Windows systems, but the public data shows user interaction is required and no confidentiality or integrity impact is scored.
Executive priority
Treat this as a routine but real availability-risk patching item. It does not warrant emergency response from the supplied evidence, but unpatched Windows estates, especially legacy systems, should be remediated through normal vulnerability management.
Technical view
The CVSS 3.1 vector is 6.5 medium: network attack vector, low complexity, no privileges, required user interaction, unchanged scope, and high availability impact only. Microsoft lists many Windows client and server versions as affected, with official remediation available.
Likely exposure
Exposure is likely wherever affected Windows client or server versions remain unpatched, including Windows 10 releases, Windows Server 2016/2019/2004/20H2, Windows 8.1, Windows 7 SP1, and Windows Server 2008 SP2 variants.
Exploitation context
The provided sources do not show active exploitation. KEV is false, and the CVSS exploit-code maturity is unproven. User interaction is required, so this is not evidenced as a fully unauthenticated, no-click service compromise.
Researcher notes
Key constraints are availability-only impact, required user interaction, and official remediation availability. The source bundle lacks CWE detail, exploit specifics, or Microsoft workaround text, so validation should focus on affected-version matching and patch applicability.
Mitigation direction
- Apply the Microsoft security update referenced by the MSRC advisory.
- Prioritize unsupported or legacy Windows versions for upgrade, isolation, or retirement.
- Confirm security update coverage across both client and server Windows fleets.
- Check Microsoft guidance for any product-specific servicing requirements.
- Avoid relying on workarounds not named by Microsoft.
Validation and detection
- Inventory systems matching the affected Windows versions in the source bundle.
- Compare each system patch state against Microsoft MSRC guidance for CVE-2021-24080.
- Review vulnerability scanner findings for this CVE and confirm remediation evidence.
- Identify legacy Windows 7 and Server 2008 systems needing special handling.
- Document exceptions where systems cannot be patched promptly.
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-2021-24080 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:N/I:N/A:H/E:U/RL:O/RC:C2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/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-2021-24080CVE 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.