Security readout for executives and security teams
Plain-English summary
A critical Microsoft Exchange Server authentication weakness could let a remote, unauthenticated attacker gain elevated access and seriously affect email confidentiality, integrity, and availability. CISA lists the vulnerability as known exploited, making affected on-premises Exchange systems an urgent business risk.
Executive priority
Treat this as an immediate remediation and investigation priority. Critical technical impact, unauthenticated network reachability, and CISA-confirmed exploitation create credible compromise risk. Require rapid inventory, patch confirmation, exposure reduction, and review for prior intrusion.
Technical view
CVE-2024-21410 is an Exchange Server elevation-of-privilege vulnerability categorized as CWE-287. Its CVSS 3.1 vector indicates network exploitation with low complexity, no privileges, and no user interaction, with high confidentiality, integrity, and availability impact. The supplied sources do not describe the exploitation mechanism.
Likely exposure
The bundle identifies Exchange Server 2016 CU23 and Exchange Server 2019 CU13 and CU14 as affected. Exposure is most concerning where these servers are reachable from untrusted networks. The bundle does not provide fixed build numbers or sufficient detail to determine exposure from product name alone.
Exploitation context
CISA's Known Exploited Vulnerabilities listing supports that CVE-2024-21410 has been exploited in the wild. The supplied evidence does not identify threat actors, exploitation volume, targets, indicators of compromise, or whether exploitation remains widespread.
Researcher notes
The source bundle establishes affected cumulative updates, CWE-287, CVSS 9.8, patch availability, and known exploitation. It does not establish the underlying protocol flow, prerequisites beyond the CVSS vector, fixed build numbers, public exploit availability, or indicators. Consult the Microsoft advisory for implementation-specific remediation details.
Mitigation direction
- Inventory Exchange Server 2016 CU23 and Exchange Server 2019 CU13 or CU14 deployments.
- Follow Microsoft's CVE advisory and apply the applicable security updates promptly.
- Prioritize affected servers reachable from the internet or other untrusted networks.
- Restrict unnecessary network access while remediation is pending.
- Investigate potentially exposed systems rather than assuming patching removes prior compromise.
Validation and detection
- Record each Exchange server's cumulative update, build, and installed security updates.
- Compare installed updates with Microsoft's current CVE-2024-21410 guidance.
- Rescan remediated servers using an authenticated vulnerability assessment.
- Review relevant security and Exchange logs for suspicious activity around exposed systems.
- Confirm temporary access restrictions remain effective until every affected server is remediated.
Public sources used
The source record changed after analysis: Material source record changed after analysis.
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-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2024-21410 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/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.
CISA KEV status
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:H/I:H/A:H/E:F/RL:O/RC:C3.95.9microsoftVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/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.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2024-21410 added to CISA KEV
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2024-02-15T00:00:00.000Z: CVE-2024-21410 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Exchange Server Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory, patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21410CVE reference, CISA-ADP · government-resource
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.
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.