How severe is CVE-2007-4993?

CVE-2007-4993 has a CVSS 2.0 base score of 6.9, rated medium severity.

Is CVE-2007-4993 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-4993?

CVE-2007-4993 affects Xensource Inc Xen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-4993?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2007-4993 published?

CVE-2007-4993 was published on 2007-09-27 and last updated on 2026-06-16.

CVE-2007-4993

CVE-2007-4993 is a medium-severity vulnerability in Xensource Inc Xen with a CVSS 2.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 6.9)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Xensource Inc Xen
Published: 2007-09-27
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2007-4993?: 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.
How severe is CVE-2007-4993?: CVE-2007-4993 has a CVSS 2.0 base score of 6.9, rated medium severity.
Is CVE-2007-4993 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-4993?: CVE-2007-4993 affects Xensource Inc Xen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2007-4993?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-4993 published?: CVE-2007-4993 was published on 2007-09-27 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:xensource_inc:xen:3.0.3:*:*:*:*:*:*:*

More vulnerabilities in Xensource Inc Xen

CVE-2007-3919 — Medium (CVSS 6.0): (1) xenbaked and (2) xenmon.py in Xen 3.1 and earlier allow local users to truncate arbitrary files via a symlink…
CVE-2007-5907 — Medium (CVSS 4.7): Xen 3.1.1 does not prevent modification of the CR4 TSC from applications, which allows pv guests to cause a denial of…
CVE-2007-5906 — Medium (CVSS 4.7): Xen 3.1.1 allows virtual guest system users to cause a denial of service (hypervisor crash) by using a debug register…
CVE-2008-1619 — Medium (CVSS 4.3): The ssm_i emulation in Xen 5.1 on IA64 architectures allows attackers to cause a denial of service (dom0 panic) via…
CVE-2007-6207 — Low (CVSS 2.1): Xen 3.x, possibly before 3.1.2, when running on IA64 systems, does not check the RID value for mov_to_rr, which allows…

All CVEs affecting Xensource Inc Xen →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →