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CVE-2021-28688

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Citrix Systems Hypervisor是美国思杰系统（Citrix Systems）公司的一个应用程序。用于简化操作管理，确保为密集型工作负载提供高清用户体验。 Citrix Hypervisor 存在安全漏洞，攻击者可利用该漏洞在主机系统上触发拒绝服务。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-28688

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values. This initialization went too far and may under certain conditions also overwrite pointers which are in need of cleaning up. The lack of cleanup would result in leaking persistent grants. The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains. All Linux versions having the fix for XSA-365 applied are vulnerable. XSA-365 was classified to affect versions back to at least 3.11.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Citrix Hypervisor 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Citrix Systems Hypervisor是美国思杰系统（Citrix Systems）公司的一个应用程序。用于简化操作管理，确保为密集型工作负载提供高清用户体验。 Citrix Hypervisor 存在安全漏洞，攻击者可利用该漏洞在主机系统上触发拒绝服务。
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
Linux Linux unspecified ~ 4.12 -
Linux Linux 5.11.1 -
Linux Linux 5.12-rc -
Linux Linux 5.10.18 -
Linux Linux unspecified ~ 4.12 -

II. Public POCs for CVE-2021-28688

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III. Intelligence Information for CVE-2021-28688

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Mailing List Discussions for CVE-2021-28688 (2)

Other References for CVE-2021-28688 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-28688

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