CVE-2026-20293— 思科UCS UEFI Shell安全启动绕过漏洞
一分钟漏洞结论
影响对象
Cisco Cisco Enterprise NFV Infrastructure Software
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
在思科 UCS 服务器和基于 UCS 的设备的统一可扩展固件界面（UEFI）Shell 实现中存在一个漏洞，允许拥有有效凭据的已认证攻击者（其用户角色为“用户”或“管理员”），或具备物理访问权限的未认证攻击者，绕过 UEFI 安全启动验证检查，并执行未经授权的软件。 该漏洞的原因是：当设备上启用 UEFI 安全启动时，UEFI Shell 中提供了内存写入命令。攻击者可以通过在启动时选择 UEFI Shell 启动选项，并利用可用的 Shell 命令来修改 UEFI 内存变量，从而利用此漏洞。成功利用该漏洞后，攻击
影响版本矩阵 352
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Cisco | Cisco Enterprise NFV Infrastructure Software | 4.1.1 |
affected |
3.9.1 |
affected | ||
3.5.2 |
affected | ||
3.12.2 |
affected | ||
3.6.2 |
affected | ||
3.9.2 |
affected | ||
3.11.3 |
affected | ||
3.11.1 |
affected | ||
| … +57 条更多 | |||
| Cisco | Cisco Unified Computing System (Managed) | 4.0(1a) |
affected |
4.1(1a) |
affected | ||
4.1(1b) |
affected | ||
4.0(4h) |
affected | ||
4.1(1c) |
affected | ||
4.0(4e) |
affected | ||
4.0(4g) |
affected | ||
4.0(2e) |
affected | ||
| … +93 条更多 | |||
| Cisco | Cisco Unified Computing System (Standalone) | 4.0(2g) |
affected |
3.1(2i) |
affected | ||
3.1(1d) |
affected | ||
4.0(4i) |
affected | ||
4.1(1c) |
affected | ||
4.0(2c) |
affected | ||
4.0(1e) |
affected | ||
4.0(2h) |
affected | ||
| … +172 条更多 | |||
| Cisco | Cisco Unified Computing System E-Series Software (UCSE) | 4.11.1 |
affected |
4.12.1 |
affected | ||
4.12.2 |
affected | ||
4.15.2 |
affected | ||
4.15.3 |
affected | ||
4.15.4 |
affected | ||
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一、 漏洞 CVE-2026-20293 基础信息
漏洞信息
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Vulnerability Title
Cisco UCS and UCS-Based Appliances UEFI Shell Secure Boot Bypass Vulnerability
来源: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.
This vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
暴露危险的方法或函数
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Cisco | Cisco Enterprise NFV Infrastructure Software | 4.1.1 | - |
|
| Cisco | Cisco Unified Computing System (Managed) | 4.0(1a) | - |
|
| Cisco | Cisco Unified Computing System (Standalone) | 4.0(2g) | - |
|
| Cisco | Cisco Unified Computing System E-Series Software (UCSE) | 4.11.1 | - |
|
二、漏洞 CVE-2026-20293 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
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CVE-2026-20293 厂商安全公告 (1)
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V. Comments for CVE-2026-20293
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