What is CVE-2017-8380?

CVE-2017-8380 is a critical-severity vulnerability in Qemu, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-08-28.

How severe is CVE-2017-8380?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Qemu

CVE-2017-8380

Buffer overflow in the "megasas_mmio_write" function in Qemu 2.9.0 allows remote attackers to have unspecified impact via unknown vectors.

Vulnerability class: Buffer Overflow

Published 2017-08-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.039 (89.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.039 · newest: 0.039 · change: 0.000

Affected products

Qemu — versions 2.9.0

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

security.gentoo.org/glsa/201706-03 (vendor-advisory, VDB Entry, Third Party Advisory, Issue Tracking)
lists.gnu.org/archive/html/qemu-devel/2017-04/msg04147.html (Patch, Third Party Advisory)
www.securityfocus.com/bid/98303 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-8380?: CVE-2017-8380 is a critical-severity vulnerability in Qemu, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2017-08-28.
How severe is CVE-2017-8380?: Critical severity. CVSS v3 base score is 9.8 out of 10.