Security readout for executives and security teams
Plain-English summary
CVE-2021-2157 is a high-severity Oracle WebLogic Server vulnerability in the TopLink Integration component. An unauthenticated attacker with HTTP network access could compromise confidentiality, potentially gaining unauthorized access to critical data or all data reachable by the affected WebLogic Server.
Executive priority
Treat this as a high-priority confidentiality risk for affected WebLogic systems. It is not rated critical and the provided sources do not confirm active exploitation, but the unauthenticated HTTP attack path and potential access to critical data warrant prompt verification and patch governance.
Technical view
Affected WebLogic Server versions are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, and 12.2.1.4.0. CVSS 3.1 is 7.5 with network attack vector, low complexity, no privileges, no user interaction, and high confidentiality impact. Integrity and availability impacts are not identified in the source bundle.
Likely exposure
Exposure is most likely where affected Oracle WebLogic Server deployments are reachable over HTTP, especially internet-facing or broadly accessible internal systems. Environments not running the listed versions are not indicated as affected by the provided sources.
Exploitation context
The source describes the issue as easily exploitable by an unauthenticated attacker over HTTP. The bundle does not show CISA KEV listing or other cited evidence of active exploitation, so active exploitation should not be assumed from these sources.
Researcher notes
The source bundle does not provide CWE classification, root-cause detail, exploit primitives, or detection signatures. Analysis should stay anchored to Oracle WebLogic Server TopLink Integration, affected versions, CVSS vector, and Oracle CPU guidance.
Mitigation direction
- Identify WebLogic Server instances running the listed affected versions.
- Review Oracle April 2021 CPU guidance for the applicable WebLogic Server update.
- Apply the vendor-supported security update or current Oracle guidance.
- Restrict HTTP access to WebLogic Server from untrusted networks where feasible.
- Prioritize internet-facing or sensitive-data WebLogic deployments first.
Validation and detection
- Inventory WebLogic Server versions across production and non-production environments.
- Confirm whether TopLink Integration is present in affected WebLogic deployments.
- Verify Oracle CPU or later security update status through approved patch records.
- Map HTTP exposure for each affected WebLogic Server instance.
- Review access logs for unusual unauthenticated requests without assuming compromise.
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-2021-2157 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.oracle.com/security-alerts/cpuapr2021.htmlCVE reference · x_refsource_MISC
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.