Security readout for executives and security teams
Plain-English summary
CVE-2021-2009 is a denial-of-service vulnerability in Oracle MySQL Server. A highly privileged attacker who can reach the database over the network could make MySQL hang or crash repeatedly. The issue affects MySQL Server 8.0.19 and earlier. The business risk is service disruption, not confirmed data theft or tampering.
Executive priority
Treat this as a moderate-priority availability risk. Prioritize systems where MySQL supports customer-facing or operationally critical services, especially if privileged access is broadly shared or database network access is loosely controlled.
Technical view
The flaw is in MySQL Server’s Security: Roles component. The CVSS 3.1 vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, scored 4.9. It requires high privileges and network access via multiple protocols. Successful exploitation can cause complete availability loss through hangs or repeatable crashes.
Likely exposure
Exposure is most likely where MySQL Server 8.0.19 or earlier remains deployed and reachable by privileged database users or service accounts over network-accessible protocols. Internet exposure is not required, but broad internal database access increases operational risk.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires a high-privileged attacker, reducing likelihood, but the low attack complexity and complete availability impact make it important for critical database services.
Researcher notes
The public record identifies the affected component, impact, CVSS vector, and affected version range, but does not provide CWE detail or exploit evidence in the supplied bundle. Avoid assuming confidentiality or integrity impact; the documented impact is availability only.
Mitigation direction
- Update MySQL Server according to Oracle’s January 2021 Critical Patch Update guidance.
- Apply Fedora, Gentoo, NetApp, or other supplier updates where MySQL is vendor-packaged.
- Restrict network access to MySQL to only trusted application hosts and administrators.
- Review and minimize high-privilege MySQL accounts and service account permissions.
- Monitor vendor advisories for fixed-version details if local packaging obscures upstream versioning.
Validation and detection
- Inventory MySQL Server instances and identify versions 8.0.19 or earlier.
- Confirm package or appliance advisory status against Oracle and relevant downstream vendors.
- Review privileged database accounts that can connect over the network.
- Check database monitoring for unexplained hangs, crashes, or repeated restarts.
- Verify backup and recovery procedures for systems dependent on affected MySQL services.
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-2021-2009 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
- 4.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
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:H/UI:N/S:U/C:N/I:N/A:H1.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.9MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.oracle.com/security-alerts/cpujan2021.htmlCVE reference · x_refsource_MISC
- FEDORA-2021-db50ab62d3CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-b1d1655cefCVE reference · vendor-advisory, x_refsource_FEDORA
- https://security.netapp.com/advisory/ntap-20210219-0003/CVE reference · x_refsource_CONFIRM
- GLSA-202105-27CVE reference · vendor-advisory, x_refsource_GENTOO
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.