Security readout for executives and security teams
Plain-English summary
CVE-2020-2926 is a denial-of-service flaw in Oracle MySQL Server's Group Replication GCS component. An attacker already holding high privileges and network access could make the server hang or crash repeatedly. The business impact is service availability, not data theft or modification, based on the provided CVSS vector.
Executive priority
Handle in normal patch governance, escalating for critical production clusters or exposed administrative networks. The vulnerability is medium severity because exploitation requires high privilege and difficulty is high, but downtime on business-critical MySQL systems can still be material.
Technical view
Oracle identifies affected MySQL Server versions as 8.0.19 and prior. The CVSS 3.0 score is 4.4 with network attack vector, high complexity, high privileges required, no user interaction, unchanged scope, and high availability impact only. The affected component is Server: Group Replication GCS.
Likely exposure
Exposure is most relevant where MySQL Server 8.0.19 or earlier is deployed, especially systems using or permitting Group Replication-related access. The privilege requirement materially lowers broad internet risk, but production database availability can still be affected if a privileged network-accessible account is compromised.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Oracle describes exploitation as difficult and requiring high privileges plus network access via multiple protocols. Treat this as a targeted or post-compromise denial-of-service risk, not a confirmed mass-exploitation issue.
Researcher notes
Evidence is limited to vendor and CVE records in the bundle. No CWE, proof-of-concept status, affected CPEs, fixed version, or active exploitation evidence is provided. Avoid assuming confidentiality or integrity impact because the CVSS vector lists availability impact only.
Mitigation direction
- Identify MySQL Server instances at version 8.0.19 or earlier.
- Review Oracle April 2020 CPU and OS vendor advisories for applicable updates.
- Upgrade or replace affected vendor packages according to supported vendor guidance.
- Restrict network access to MySQL from trusted hosts only.
- Limit high-privilege MySQL accounts and audit their recent use.
Validation and detection
- Inventory MySQL versions across production, staging, and backup hosts.
- Confirm whether Group Replication is enabled or operationally required.
- Check package advisory status for Oracle, Ubuntu, Fedora, Gentoo, or NetApp distributions.
- Review database access logs for high-privilege network logins.
- Verify monitoring alerts on MySQL hangs, crashes, and repeated restarts.
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-2020-2926 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
- 4.4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/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:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H0.73.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.4MediumVector: CVSS:3.0/AV:N/AC:H/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/cpuapr2020.htmlCVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20200416-0003/CVE reference · x_refsource_CONFIRM
- USN-4350-1CVE reference · vendor-advisory, x_refsource_UBUNTU
- FEDORA-2020-20ac7c92a1CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2020-136dc82437CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2020-261c9ddd7cCVE reference · vendor-advisory, x_refsource_FEDORA
- 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.