Security readout for executives and security teams
Plain-English summary
This MySQL Server flaw can let an already highly privileged remote user crash or hang the database service. It is not described as a data theft or data modification issue, but it can disrupt applications that depend on affected MySQL versions.
Executive priority
Treat this as a service reliability risk, not a confidentiality breach based on current sources. Prioritize patching databases that support critical applications, especially where privileged database access is broadly available or externally reachable.
Technical view
CVE-2021-35575 affects Oracle MySQL Server 8.0.26 and prior in the Server: Optimizer component. The CVSS vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, meaning network-reachable exploitation requires high privileges and primarily causes complete denial of service.
Likely exposure
Exposure is most likely where MySQL Server 8.0.26 or earlier remains deployed and high-privilege database accounts can connect over network-accessible MySQL protocols. Internet exposure is less central than privileged account control and service availability impact.
Exploitation context
The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. The issue is described as easily exploitable after obtaining high privileges, with impact limited to availability through hangs or repeatable crashes.
Researcher notes
Available sources identify affected versions, component, CVSS, and availability impact, but do not provide root-cause detail, exploit indicators, or exact fixed build information in the bundle. Validation should focus on version state, vendor advisory applicability, privilege exposure, and crash telemetry.
Mitigation direction
- Inventory MySQL Server instances and identify versions 8.0.26 or earlier.
- Apply Oracle CPU or supported vendor package updates for affected MySQL deployments.
- Review Fedora package advisories where MySQL was installed from Fedora repositories.
- Check NetApp guidance if MySQL is embedded or bundled in NetApp products.
- Restrict network access to MySQL services to trusted hosts only.
- Reduce and monitor high-privilege MySQL accounts with remote access.
Validation and detection
- Confirm each MySQL Server version is newer than the affected 8.0.26-and-prior range.
- Verify vendor security updates are installed from Oracle, Fedora, NetApp, or other applicable suppliers.
- Review database accounts with high privileges and remote login capability.
- Check logs and monitoring for unexplained MySQL crashes, hangs, or restart loops.
- Confirm MySQL ports are not reachable from untrusted networks.
- Document exceptions where patching depends on vendor appliance guidance.
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-2021-35575 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/cpuoct2021.htmlCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20211022-0003/CVE reference · x_refsource_CONFIRM
- FEDORA-2021-70dd0b9f5dCVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-46dc82116bCVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-f74148c6d4CVE reference · vendor-advisory, x_refsource_FEDORA
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.