What is CVE-2015-8743?

CVE-2015-8743 is a high-severity vulnerability in Qemu, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2016-12-29.

How severe is CVE-2015-8743?

High severity. CVSS v3 base score is 7.1 out of 10.

Is CVE-2015-8743 known to be exploited?

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

Out-of-bounds Read in Qemu

CVE-2015-8743

QEMU (aka Quick Emulator) built with the NE2000 device emulation support is vulnerable to an OOB r/w access issue. It could occur while performing 'ioport' r/w operations. A privileged (CAP_SYS_RAWIO) user/process could use this flaw to leak or corrupt QEMU memory bytes.

Vulnerability class: Buffer Overflow

Published 2016-12-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Qemu
Debian Linux — versions 7.0, 8.0

Weakness classification (CWE)

Public proof-of-concept exploits

RUB-SysSec/Hypercube

References

www.openwall.com/lists/oss-security/2016/01/04/2 (mailing-list, Mailing List, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Issue Tracking)
www.securitytracker.com/id/1034574 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/79820 (VDB Entry, Third Party Advisory, vdb-entry)
www.openwall.com/lists/oss-security/2016/01/04/1 (mailing-list, Mailing List, Third Party 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)
lists.gnu.org/archive/html/qemu-devel/2016-01/msg00050.html (Vendor Advisory, mailing-list, Patch)
www.debian.org/security/2016/dsa-3471 (vendor-advisory, Third Party Advisory)
security.gentoo.org/glsa/201602-01 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2015-8743?: CVE-2015-8743 is a high-severity vulnerability in Qemu, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2016-12-29.
How severe is CVE-2015-8743?: High severity. CVSS v3 base score is 7.1 out of 10.
Is CVE-2015-8743 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.