How severe is CVE-2011-1583?

CVE-2011-1583 has a CVSS 2.0 base score of 6.9, rated medium severity.

Is CVE-2011-1583 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1583?

CVE-2011-1583 primarily affects Citrix Xen. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1583?

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

When was CVE-2011-1583 published?

CVE-2011-1583 was published on 2011-08-12 and last updated on 2026-06-16.

CVE-2011-1583

CVE-2011-1583 is a medium-severity vulnerability in Citrix 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-189.

Key facts

Severity: Medium (CVSS 2.0 base score 6.9)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Citrix Xen
Published: 2011-08-12
Last modified: 2026-06-16

Description

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 cause a denial of service and possibly execute arbitrary code via a crafted paravirtualised guest kernel image that triggers (1) a buffer overflow during a decompression loop or (2) an out-of-bounds read in the loader involving unspecified length fields.

Frequently asked questions

What is CVE-2011-1583?: 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 cause a denial of service and possibly execute arbitrary code via a crafted paravirtualised guest kernel image that triggers (1) a buffer overflow during a decompression loop or (2) an out-of-bounds read in the loader involving unspecified length fields.
How severe is CVE-2011-1583?: CVE-2011-1583 has a CVSS 2.0 base score of 6.9, rated medium severity.
Is CVE-2011-1583 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1583?: CVE-2011-1583 primarily affects Citrix Xen. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1583?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1583 published?: CVE-2011-1583 was published on 2011-08-12 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:citrix:xen:3.2.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:3.3.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:citrix:xen:4.1.0:*:*:*:*:*:*:*

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-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…
CVE-2010-4247 — Medium (CVSS 5.5): The do_block_io_op function in (1) drivers/xen/blkback/blkback.c and (2) drivers/xen/blktap/blktap.c in Xen before…

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Other CWE-189 (Numeric Errors) vulnerabilities

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CVE-2015-7205 — Critical (CVSS 10.0): Integer underflow in the RTPReceiverVideo::ParseRtpPacket function in Mozilla Firefox before 43.0 and Firefox ESR 38.x…
CVE-2015-6575 — Critical (CVSS 10.0): SampleTable.cpp in libstagefright in Android before 5.1.1 LMY48I does not properly consider integer promotion, which…
CVE-2015-3864 — Critical (CVSS 10.0): Integer underflow in the MPEG4Extractor::parseChunk function in MPEG4Extractor.cpp in libstagefright in mediaserver in…
CVE-2015-3836 — Critical (CVSS 10.0): The Parse_wave function in arm-wt-22k/lib_src/eas_mdls.c in the Sonivox DLS-to-EAS converter in Android before 5.1.1…
CVE-2015-3834 — Critical (CVSS 10.0): Multiple integer overflows in the BnHDCP::onTransact function in media/libmedia/IHDCP.cpp in libstagefright in Android…

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