CVE-2024-5661

Host slowdown or unresponsiveness

Published Jun 13, 2024 · Updated Oct 28, 2024

Denial of service in Citrix XenServer 8 allows guest OS users with administrative privileges to make the host slow or unresponsive. Citrix identifies the patched area as Xen Device Model but has not disclosed the faulty operation or the guest input that triggers it. All deployments are affected, but exploitation requires privileged guest VM access and has no reported confidentiality or integrity impact.

CVSS severity6.0
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Citrix XenServer 8 allows guest OS users with administrative privileges to make the host slow or unresponsive. Citrix identifies the patched area as Xen Device Model but has not disclosed the faulty operation or the guest input that triggers it. All deployments are affected, but exploitation requires privileged guest VM access and has no reported confidentiality or integrity impact.

The record

CVE
CVE-2024-5661
Published
Jun 13, 2024
Updated
Oct 28, 2024
Vendor
Citrix
Product
XenServer
Classifications
CWE-799, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8 <=0
  2. Affected versionversion=8.2 CU1 LTSR <=XS82ECU1068

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Citrix · XenServerversion=8 <=0; version=8.2 CU1 LTSR <=XS82ECU1068

Published CVSS scores

6.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
6.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-799Improper Control of Interaction Frequency
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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