CVE-2015-8743 [High] | Out-of-bounds Read in Qemu

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.06%	0.45%	+0.38%
2	2025-03-30	0.17%	0.06%	-0.11%
3	2025-03-29	—	0.17%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.06%

0.45%

+0.38%

2025-03-30

0.17%

0.06%

-0.11%

2025-03-29

—

0.17%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.1	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:N) Service keeps running; no real outage angle.	1.8	5.2	[email protected]
3.6	2.0	LOW	`AV:L/AC:L/Au:N/C:P/I:P/A:N` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	3.9	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.1

3.1

HIGH

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N): Service keeps running; no real outage angle.

1.8

5.2

[email protected]

3.6

2.0

LOW

AV:L/AC:L/Au:N/C:P/I:P/A:N Click to expand

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

3.9

4.9

[email protected]

OS Trackers for CVE-2015-8743

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2015-8743 not yet assigned priority: Debian including 1 source packages (qemu), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2015-8743
`gentoo`	normal	CVE-2015-8743: 1 GLSA(s) (201602-01), 1 atom(s) (app-emulation/qemu); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-8743
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2015-8743
`suse`	medium	CVE-2015-8743 severity moderate: SUSE including 912 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 1241 product×package rows across 68 product lines (HPE Helion OpenStack 8, SUSE Linux Enterprise Desktop 11 SP4, … (68 product lines)): Fixed 961, Known Affected 157, Known Not Affected 123.	https://www.suse.com/security/cve/CVE-2015-8743/
`ubuntu`	medium	CVE-2015-8743 medium priority: Ubuntu including 2 source packages (qemu, qemu-kvm), 10 status rows across 5 suites (precise, trusty, upstream, vivid, wily): DNE 4, released 3, needs-triage 2, ignored 1.	https://ubuntu.com/security/CVE-2015-8743

Affected software / configurations for CVE-2015-8743

Vendor	Product	Version	Raw CPE
qemu	qemu	<= 2.5.1	cpe:2.3:a:qemu:qemu::::::::
debian	debian_linux	7.0	cpe:2.3:o:debian:debian_linux:7.0:::::::*
debian	debian_linux	8.0	cpe:2.3:o:debian:debian_linux:8.0:::::::*

References for CVE-2015-8743

URL	Tags
http://www.debian.org/security/2016/dsa-3469	Third Party Advisory
http://www.debian.org/security/2016/dsa-3470	Third Party Advisory
http://www.debian.org/security/2016/dsa-3471	Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/01/04/1	Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/01/04/2	Mailing List Third Party Advisory
http://www.securityfocus.com/bid/79820	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1034574	Third Party Advisory VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1264929	Issue Tracking
https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg00050.html	Patch Vendor Advisory
https://security.gentoo.org/glsa/201602-01	Third Party Advisory

URL

CVE-2015-8743

Exploit prediction scoring system (EPSS) score for CVE-2015-8743

Common vulnerability scoring system (CVSS) metrics for CVE-2015-8743

Weakness enumeration for CVE-2015-8743

OS Trackers for CVE-2015-8743

Affected software / configurations for CVE-2015-8743

References for CVE-2015-8743