How severe is CVE-2010-4247?

CVE-2010-4247 has a CVSS 2.0 base score of 5.5, rated medium severity.

Is CVE-2010-4247 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-4247?

CVE-2010-4247 primarily affects Citrix Xen. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2010-4247?

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

When was CVE-2010-4247 published?

CVE-2010-4247 was published on 2011-01-11 and last updated on 2026-06-16.

CVE-2010-4247

CVE-2010-4247 is a medium-severity vulnerability in Citrix Xen with a CVSS 2.0 base score of 5.5. 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 5.5)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Citrix Xen
Published: 2011-01-11
Last modified: 2026-06-16

Description

The do_block_io_op function in (1) drivers/xen/blkback/blkback.c and (2) drivers/xen/blktap/blktap.c in Xen before 3.4.0 for the Linux kernel 2.6.18, and possibly other versions, allows guest OS users to cause a denial of service (infinite loop and CPU consumption) via a large production request index to the blkback or blktap back-end drivers. NOTE: some of these details are obtained from third party information.

Frequently asked questions

What is CVE-2010-4247?: The do_block_io_op function in (1) drivers/xen/blkback/blkback.c and (2) drivers/xen/blktap/blktap.c in Xen before 3.4.0 for the Linux kernel 2.6.18, and possibly other versions, allows guest OS users to cause a denial of service (infinite loop and CPU consumption) via a large production request index to the blkback or blktap back-end drivers. NOTE: some of these details are obtained from third party information.
How severe is CVE-2010-4247?: CVE-2010-4247 has a CVSS 2.0 base score of 5.5, rated medium severity.
Is CVE-2010-4247 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-4247?: CVE-2010-4247 primarily affects Citrix Xen. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2010-4247?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-4247 published?: CVE-2010-4247 was published on 2011-01-11 and last updated on 2026-06-16.

References

Affected products (12)

cpe:2.3:a:citrix:xen:*:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.0.4:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.1.3:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.1.4:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.2.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.2.1:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.2.2:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.2.3:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.3.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.3.1:*:*:*:*:*:*:*

More vulnerabilities in Citrix Xen

CVE-2011-1898 — High (CVSS 7.4): Xen 4.1 before 4.1.1 and 4.0 before 4.0.2, when using PCI passthrough on Intel VT-d chipsets that do not have interrupt…
CVE-2008-5716 — High (CVSS 7.2): xend in Xen 3.3.0 does not properly restrict a guest VM's write access within the /local/domain xenstore directory…
CVE-2008-4405 — High (CVSS 7.2): xend in Xen 3.0.3 does not properly limit the contents of the /local/domain xenstore directory tree, and does not…
CVE-2011-1583 — Medium (CVSS 6.9): Multiple integer overflows in tools/libxc/xc_dom_bzimageloader.c in Xen 3.2, 3.3, 4.0, and 4.1 allow local users to…
CVE-2010-4255 — Medium (CVSS 6.1): The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization…
CVE-2010-4238 — Medium (CVSS 5.5): The vbd_create function in Xen 3.1.2, when the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 is used, allows…

All CVEs affecting Citrix 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 →