Security readout for executives and security teams
Plain-English summary
This flaw lets a low-privileged remote user impersonate other users in affected SUSE Rancher installations. That can undermine administrative control of Kubernetes environments because the CVSS impact rates confidentiality, integrity, and availability as high.
Executive priority
Prioritize remediation for internet-facing or shared Rancher management planes. The issue can let a lesser user act as someone else, creating direct risk to Kubernetes administration and hosted workloads.
Technical view
CVE-2021-36776 is an improper access control issue in the SUSE Rancher Steve API proxy. Sources state Rancher versions prior to 2.5.10 are affected. CVSS 3.1 is 8.8 with network access, low privileges, no user interaction, and high CIA impact.
Likely exposure
Exposure is limited to SUSE Rancher deployments running versions before 2.5.10. Risk is higher where Rancher API or management access is reachable by broadly provisioned authenticated users or untrusted networks.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation evidence. CVSS indicates exploitation requires network access and low privileges, but no user interaction.
Researcher notes
Evidence is sparse in the provided sources. The key confirmed details are affected product, version threshold, access-control class, impersonation impact, and CVSS vector. No exploit technique, patch note detail, or affected CPE list is included.
Mitigation direction
- Upgrade affected Rancher deployments to 2.5.10 or later.
- Check SUSE Rancher guidance and Bugzilla for environment-specific remediation details.
- Restrict Rancher UI and API access to trusted networks and administrators.
- Review user and role assignments for unnecessary low-privilege access.
- Increase monitoring of Rancher authentication and authorization activity.
Validation and detection
- Inventory all Rancher instances and record exact versions.
- Confirm no production Rancher instance runs below 2.5.10.
- Verify Rancher API and management endpoints are not broadly exposed.
- Review audit logs for unexpected user impersonation or privilege activity.
- Confirm access controls align with least-privilege expectations.
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.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-36776 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.suse.com/show_bug.cgi?id=1189413CVE 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.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.