CVE-2021-31999— Rancher: Privilege escalation vulnerability via malicious Connection header
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I. Basic Information for CVE-2021-31999
Vulnerability Information
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Vulnerability Title
Rancher: Privilege escalation vulnerability via malicious Connection header
Source: NVD (National Vulnerability Database)
Vulnerability Description
A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
在安全决策中依赖未经信任的输入
Source: NVD (National Vulnerability Database)
Vulnerability Title
Rancher Labs Rancher 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rancher Labs Rancher是美国Rancher Labs公司的一套开源的企业级容器管理平台。 Rancher Labs Rancher 存在安全漏洞，该漏洞源于在Rancher的安全决策漏洞中依赖不可信的输入。攻击者可利用该漏洞通过伪造“Impersonate-User”或“Impersonate-Group”头充当集群中的其他用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Rancher | Rancher | Rancher ~ 2.5.9 | - | |
| Rancher | SUSE Linux Enterprise Server 15 | Rancher ~ 2.4.16 | - |
II. Public POCs for CVE-2021-31999
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://bugzilla.suse.com/show_bug.cgi?id=1187084x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2021-31999
Same Patch Batch · Rancher · 2021-07-15 · 3 CVEs total
| CVE-2021-25320 | 9.9 CRITICAL | Rancher: Cloud credentials can be used through proxy API by users without access |
| CVE-2021-25318 | 8.8 HIGH | rancher: API group not properly specified when creating Kubernetes RBAC resources |
IV. Related Vulnerabilities
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Rancher exposes sensitive information through audit logs - CVE-2023-32199
Rancher user retains access to clusters despite Global Role
Same weakness: CWE-807
- CVE-2026-6213
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OpenClaw < 2026.3.31 - Access Control Bypass via Proxied Rem - CVE-2026-41390
OpenClaw < 2026.3.28 - Exec Allowlist Bypass via Unregistere - CVE-2026-41380
OpenClaw < 2026.3.28 - Arbitrary Execution Allowlist via Wra
V. Comments for CVE-2021-31999
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