What is CVE-2015-7504?

CVE-2015-7504 is a high-severity vulnerability in Qemu, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2017-10-16.

How severe is CVE-2015-7504?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2015-7504 known to be exploited?

8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Qemu

CVE-2015-7504

Heap-based buffer overflow in the pcnet_receive function in hw/net/pcnet.c in QEMU allows guest OS administrators to cause a denial of service (instance crash) or possibly execute arbitrary code via a series of packets in loopback mode.

Vulnerability class: Buffer Overflow

Published 2017-10-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Qemu — versions 2.5.0
Xen
Debian Linux — versions 7.0, 8.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

rhn.redhat.com/errata/RHSA-2015-2694.html (vendor-advisory, Third Party Advisory)
www.securitytracker.com/id/1034268 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/78227 (VDB Entry, Third Party Advisory, vdb-entry)
www.openwall.com/lists/oss-security/2015/11/30/2 (mailing-list, Patch, Mailing List, Third Party Advisory)
lists.gnu.org/archive/html/qemu-devel/2015-11/msg06342.html (mailing-list, Patch, Mailing List, Third Party Advisory)
xenbits.xen.org/xsa/advisory-162.html (Patch, Mitigation, Vendor Advisory)
www.debian.org/security/2016/dsa-3469 (vendor-advisory, Third Party Advisory)
www.debian.org/security/2016/dsa-3470 (vendor-advisory, Third Party Advisory)
security.gentoo.org/glsa/201604-03 (vendor-advisory, Patch, VDB Entry, Third Party Advisory)
www.debian.org/security/2016/dsa-3471 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2015-7504?: CVE-2015-7504 is a high-severity vulnerability in Qemu, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2017-10-16.
How severe is CVE-2015-7504?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2015-7504 known to be exploited?: 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.