Denial of service in Citrix XenServer

1) Improper error handling

EUVDB-ID: #VU112090

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-27465

CWE-ID: CWE-388 - Error Handling

Exploit availability: No

Description

The vulnerability allows a local guest to crash the hypervisor.

The vulnerability exists die to incorrect stubs exception handling for flags recovery. A malicious guest can force the hypervisor to crash. 

Mitigation

Install update from vendor's website.

Vulnerable software versions

Citrix XenServer: 8.4

CPE2.3

• cpe:2.3:a:citrix:citrix_xenserver:8.4:*:*:*:*:*:*:*

External links

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694780

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.