CVE-2009-3525

The pyGrub boot loader in Xen 3.0.3, 3.3.0, and Xen-3.3.1 does not support the password option in...

7.2 HighPublic exploitFix available

The pyGrub boot loader in Xen 3.0.3, 3.3.0, and Xen-3.3.1 does not support the password option in grub.conf for para-virtualized guests, which allows attackers with access to the para-virtualized guest console to boot the guest or modify the guest's kernel boot parameters without providing the expected password.

Exploit likelihood

1.24%Down 3.4 points since Feb 4, 2022

What each source reports

NVD Score used 7.2

Record: CVE-2009-3525
CVSS 2.0: 7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-264
Updated: 2026-11-02

CVE List No score

Record: CVE-2009-3525
Updated: 2026-11-02

EUVDEUVD-2009-3507 No score

Record: EUVD-2009-3507
Updated: 2026-11-03

GitHub AdvisoriesGHSA-8xjx-475c-5hjg No score

The pyGrub boot loader in Xen 3.0.3, 3.3.0, and Xen-3.3.1 does not support the password option in...

Record: GHSA-8xjx-475c-5hjg
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`xen` Red Hat:rhel_virtualization:5::client	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen-debuginfo` Red Hat:rhel_virtualization:5::client	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen-devel` Red Hat:rhel_virtualization:5::client	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen` Red Hat:enterprise_linux:5::client	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen-debuginfo` Red Hat:enterprise_linux:5::client	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen-libs` Red Hat:enterprise_linux:5::client	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen` Red Hat:rhel_virtualization:5::server	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen-debuginfo` Red Hat:rhel_virtualization:5::server	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen-devel` Red Hat:rhel_virtualization:5::server	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen` Red Hat:enterprise_linux:5::server	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen-debuginfo` Red Hat:enterprise_linux:5::server	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1
`xen-libs` Red Hat:enterprise_linux:5::server	before 0:3.0.3-94.el5_4.1	0:3.0.3-94.el5_4.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	Xen 3.x - pygrub Local Authentication Bypass	2009-09-25

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-3525 is a high vulnerability (CVSS 7.2) in Xen, published October 5, 2009. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.24%, the 69th percentile. Fixed in xen 0:3.0.3-94.el5_4.1.

References

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