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CVE-2015-6855

20
FAUCET Score

CVE-2015-6855 describes a denial-of-service vulnerability in QEMU's hw/ide/core.c, affecting QEMU and related distributions like Debian and Fedora. A guest user can trigger a divide-by-zero error and crash the QEMU instance by sending specific IDE commands, such as WIN_READ_NATIVE_MAX to an empty ATAPI device. This vulnerability has a CVSS v3.1 score of 7.5 (HIGH), indicating a network-based attack with low complexity and high impact on availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.4.1CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
21CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.50%
Probability of exploitation in next 30 days
EPSS Percentile
87.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0350 is in the 79th percentile among its peer group of 51,551 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (8)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: kvm
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xen
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: qemu-kvm
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: qemu-kvm
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: qemu-kvm-rhev
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 5 (Icehouse)Fixed in: qemu-kvm-rhev
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 6 (Juno)Fixed in: qemu-kvm-rhev
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)Fixed in: qemu-kvm-rhev

Vendor Advisories (1)

redhatCVE-2015-6855Low

Qemu: ide: divide by zero issue

Sep 9, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-October/168602.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-October/169036.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-October/169039.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-October/169327.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-October/169341.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-September/167369.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-10/msg00019.html
Mailing ListThird Party Advisory
lists.gnu.org / archive/html/qemu-devel/2015-09/msg02479.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201602-01
Third Party Advisory
arista.com / en/support/advisories-notices/security-advisories/1188-security-advisory-14
Third Party Advisory
debian.org / security/2015/dsa-3361
Third Party Advisory
debian.org / security/2015/dsa-3362
Third Party Advisory
openwall.com / lists/oss-security/2015/09/10/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2015/09/10/2
Mailing ListThird Party Advisory
securityfocus.com / bid/76691
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-2745-1
Third Party Advisory