Security readout for executives and security teams
Plain-English summary
CVE-2020-2763 is a denial-of-service flaw in Oracle MySQL Server replication. A highly privileged attacker with network access could make affected MySQL Server versions hang or crash repeatedly. It is not described as data theft or data modification, but outages could affect applications relying on vulnerable database servers.
Executive priority
Treat this as a service availability risk, not a confirmed breach risk. Prioritize production databases, replicated environments, and systems where privileged database access is broadly distributed. Patch through normal database maintenance windows unless business-critical MySQL services are exposed to many privileged users.
Technical view
Oracle lists affected MySQL Server versions as 5.6.47 and prior, 5.7.29 and prior, and 8.0.19 and prior. The vulnerable component is Server: Replication. CVSS 3.0 is 4.9 with network attack vector, low complexity, high privileges required, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where affected MySQL Server versions are reachable over allowed database or replication-related network paths by privileged database users or administrators. Internet exposure is not required by the source description, but network access via multiple protocols is enough if the attacker already has high privileges.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Oracle describes the issue as easily exploitable, but only by a high-privileged attacker with network access. Successful exploitation causes a hang or frequently repeatable crash, resulting in complete denial of service for MySQL Server.
Researcher notes
Evidence supports availability-only impact with high privileges required. The public bundle does not include exploit details, CWE mapping, or proof of active exploitation. Focus validation on version exposure, replication context, privileged access paths, and vendor advisory alignment rather than speculative exploit mechanics.
Mitigation direction
- Apply Oracle April 2020 CPU guidance for affected MySQL Server deployments.
- Update distro packages using the referenced Ubuntu, Fedora, or Gentoo advisories where applicable.
- Check NetApp advisory applicability for products bundling or depending on MySQL components.
- Restrict privileged MySQL access to trusted administrators and management networks.
- Review vendor guidance before assuming a configuration-only workaround exists.
Validation and detection
- Inventory MySQL Server versions and flag 5.6.47, 5.7.29, 8.0.19, and earlier.
- Identify systems using MySQL replication or exposing replication-capable server paths.
- Confirm installed packages match vendor-fixed builds from Oracle or relevant Linux distribution advisories.
- Review database logs and monitoring for unexplained MySQL hangs or repeated crashes.
- Validate privileged database accounts are limited, current, and monitored.
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-2020-2763 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 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/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:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H1.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.9MediumVector: CVSS:3.0/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/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.