Security readout for executives and security teams
Plain-English summary
CVE-2020-2759 is a MySQL Server replication vulnerability that can let a highly privileged network attacker crash or hang the database. The impact is service availability, not data theft or data modification according to the CVSS vector. Business urgency depends on whether exposed MySQL 8.0.19 or earlier instances support critical workloads.
Executive priority
Prioritize remediation on business-critical MySQL systems, especially those with broad network reach or many privileged service accounts. This is not described as data compromise, but a repeatable database outage can still disrupt revenue, operations, and dependent applications.
Technical view
Oracle describes this as a Server: Replication flaw in MySQL Server 8.0.19 and prior. It is network reachable over multiple protocols, low complexity, requires high privileges, no user interaction, and can cause complete denial of service. CVSS 3.0 score is 4.9 with high availability impact only.
Likely exposure
Exposure is most likely where MySQL Server 8.0.19 or earlier is deployed and reachable by privileged database users or service accounts over the network. Systems using vendor-packaged MySQL or embedded MySQL distributions should be checked against Oracle and downstream vendor advisories.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The vulnerability is described as easily exploitable, but only by a high-privileged attacker with network access. Treat it mainly as an insider, compromised-admin, or overprivileged-service-account availability risk.
Researcher notes
No CWE or technical root cause is provided in the bundle. Oracle names the replication component and availability impact only. Avoid assuming exploit mechanics beyond the CVSS and description. Validation should focus on version, patch state, privilege exposure, network reachability, and operational crash evidence.
Mitigation direction
- Inventory MySQL Server versions and identify 8.0.19 or earlier instances.
- Apply Oracle April 2020 CPU fixes or downstream vendor security updates.
- Review NetApp, Ubuntu, Fedora, or Gentoo advisories if those distributions apply.
- Restrict MySQL network access to trusted hosts and required service accounts.
- Reduce unnecessary high-privilege database accounts where operationally feasible.
Validation and detection
- Confirm MySQL Server version on each in-scope host.
- Verify installed packages include the relevant vendor security update.
- Check whether replication-enabled systems are internet or broadly network reachable.
- Review privileged MySQL accounts for unnecessary access.
- Monitor database logs for repeated crashes, hangs, or unexpected 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-2020-2759 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.