Security readout for executives and security teams
Plain-English summary
Rancher could expose repository credentials to administrators of third-party repositories that receive those credentials. The business risk is credential leakage through trusted integrations, not a proven public takeover. The sources identify affected Rancher versions before 2.5.12 and before 2.6.3.
Executive priority
Prioritize remediation for Rancher environments connected to third-party repositories or using long-lived shared credentials. The issue is high severity because it can expose credentials, but current provided sources do not prove active exploitation.
Technical view
CVE-2021-36778 is an incorrect authorization issue in SUSE Rancher. Third-party repository administrators may gather credentials sent to their servers. The CVSS 3.1 score is 7.3 high, with low attack complexity and network attack vector. Source detail is limited beyond affected versions and the authorization failure category.
Likely exposure
Exposure is most likely where SUSE Rancher versions earlier than 2.5.12 or 2.6.3 use third-party repositories with credentials. Systems without third-party repository integrations may have lower practical exposure, but the source bundle does not define all prerequisite conditions.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The plausible threat actor is a third-party repository administrator who can receive credential-bearing requests. Treat this as credential exposure risk requiring review of repository trust and credential scope.
Researcher notes
The evidence names CWE-863 and affected Rancher versions only. No CPEs, exploit details, or comprehensive mitigation notes are included in the bundle. Avoid assuming broader SUSE products or Kubernetes components are affected without vendor confirmation.
Mitigation direction
- Upgrade Rancher to 2.5.12, 2.6.3, or a later vendor-supported release.
- Review SUSE Rancher advisory guidance before choosing an upgrade path.
- Rotate credentials used with third-party repositories on affected Rancher instances.
- Remove or restrict untrusted third-party repository integrations.
- Scope repository credentials to least privilege where possible.
Validation and detection
- Inventory all Rancher instances and record exact versions.
- Identify configured third-party repositories and associated credentials.
- Confirm affected instances are upgraded beyond the listed vulnerable versions.
- Review repository and Rancher audit logs for unexpected credential use.
- Verify rotated credentials no longer authenticate from old trust paths.
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-863: 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-2021-36778 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
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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:L/I:L/A:L3.93.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.suse.com/show_bug.cgi?id=1191466CVE reference
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.
Incorrect Authorization
Incorrect Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.