CVE-2008-3687

Heap-based buffer overflow in the flask_security_label function in Xen 3.3, when compiled with the XSM:FLASK module, allows unprivileged domain users (domU) to execute arbitrary code via the flask_op hypercall.

Published: 2008-08-14 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2008-3687 is rated Moderate Risk (55.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.61%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2008-3687

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-10-04 2.13% 1.61% -0.51%
2 2025-03-30 2.46% 2.13% -0.33%
3 2025-03-29 — 2.46% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2008-3687

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2008-3687

OS Trackers for CVE-2008-3687

vendor priority summary link
redhat — — https://access.redhat.com/security/cve/CVE-2008-3687
ubuntu low CVE-2008-3687 low priority: Ubuntu including 4 source packages (xen, xen-3.0, xen-3.1, xen-3.2), 20 status rows across 5 suites (dapper, feisty, gutsy, hardy, upstream): DNE 11, not-affected 5, needs-triage 4. https://ubuntu.com/security/CVE-2008-3687

Vendor comments (NVD) for CVE-2008-3687

  • Red Hat (2008-08-21T00:00:00)

    Not vulnerable. This issue did not affect the version of Xen hypervisor as shipped with Red Hat Enterprise Linux 5, as it does not support XSM.

Affected software / configurations for CVE-2008-3687

Vendor Product Version Raw CPE
xen xen 3.3 cpe:2.3:a:xen:xen:3.3:*:*:*:*:*:*:*
xen xen_flask_module — cpe:2.3:a:xen:xen_flask_module:*:*:*:*:*:*:*:*

References for CVE-2008-3687

cvelogic Threat Intelligence