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Fencer Vulns
medium 6.9

CVE-2007-4993 json

pygrub (tools/pygrub/src/GrubConf.py) in Xen 3.0.3, when booting a guest domain, allows local users with elevated privileges in the guest d…

published 2007-09-27 19 y ago modified 2026-06-16 4 mo ago also EUVD-2007-4974

cvss
6.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
1
Exploit-DB

Summary

pygrub (tools/pygrub/src/GrubConf.py) in Xen 3.0.3, when booting a guest domain, allows local users with elevated privileges in the guest domain to execute arbitrary commands in domain 0 via a crafted grub.conf file whose contents are used in exec statements.

Patch / fix

  • xen RHEL 5 VIRTUALIZATION, RHEL 5 3.0.3-25.0.4.el5
  • xen-libs RHEL 5 3.0.3-25.0.4.el5

red hat advisories RHSA-2007:0323

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2007-4993 updated

xen guest root can escape to domain 0 through pygrub

  • Red Hat Enterprise Linux (v. 5 server) xen 3.0.3-25.0.4.el5, xen-libs 3.0.3-25.0.4.el5 Red Hat Enterprise Linux Desktop (v. 5 client) xen 3.0.3-25.0.4.el5, xen-libs 3.0.3-25.0.4.el5 Red Hat Enterprise Linux Desktop Multi OS (v. 5 client) xen 3.0.3-25.0.4.el5, xen-libs 3.0.3-25.0.4.el5 Red Hat Enterprise Linux Virtualization (v. 5 server) xen 3.0.3-25.0.4.el5, xen-libs 3.0.3-25.0.4.el5
    fixed: vendor fix RHSA-2007:0323

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-30620)
  2. Published

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-30620 Xen 3.0.3 - pygrub TOOLS/PYGRUB/SRC/GRUBCONF.PY Local Command Injection local, 2007-09-22

CVSS scores

assigned by version score vector
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.