Security readout for executives and security teams
Plain-English summary
This flaw can let a highly privileged attacker crash or hang MySQL Server, causing a complete denial of service. It affects MySQL Server 8.0.26 and prior. The main business risk is database downtime, not data theft or data modification, based on the supplied CVSS impacts.
Executive priority
Handle through the database patch program, with faster action for business-critical MySQL systems where downtime would materially affect operations.
Technical view
CVE-2021-35637 affects Oracle MySQL Server, component Server: PS. The CVSS vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, meaning network reachable, low complexity, high privileges required, and availability-only impact through hangs or repeatable crashes.
Likely exposure
Exposure is most likely where MySQL Server 8.0.26 or earlier is still deployed and highly privileged database users can connect over supported network protocols.
Exploitation context
The source bundle says the issue is easily exploitable, but requires high privileges. CISA KEV status is false, and the supplied sources do not report active exploitation.
Researcher notes
Evidence supports availability impact only: no confidentiality or integrity impact is listed. The source bundle does not provide exploit details, named indicators, or an exact fixed version beyond Oracle CPU guidance.
Mitigation direction
- Review Oracle's October 2021 Critical Patch Update guidance for MySQL Server.
- Update affected MySQL Server deployments according to Oracle-supported maintenance guidance.
- Review NetApp guidance if MySQL is present in NetApp-managed environments.
- Restrict privileged MySQL network access to trusted administrative paths.
- Prioritize outage-sensitive databases during patch planning.
Validation and detection
- Inventory MySQL Server versions and identify systems at 8.0.26 or earlier.
- Confirm whether privileged accounts can connect over network-accessible protocols.
- Check vendor advisories for applicable fixed releases or platform-specific guidance.
- Review monitoring for unexplained MySQL crashes or repeated service hangs.
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-2021-35637 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
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.