What is CVE-2017-9524?

CVE-2017-9524 is a high-severity vulnerability in Qemu, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-07-06.

How severe is CVE-2017-9524?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2017-9524 known to be exploited?

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

Improper input validation in Qemu

CVE-2017-9524

The qemu-nbd server in QEMU (aka Quick Emulator), when built with the Network Block Device (NBD) Server support, allows remote attackers to cause a denial of service (segmentation fault and server crash) by leveraging failure to ensure that all initialization occurs before talking to a client in the nbd_negotiate function.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-07-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.041 (90.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.041 · newest: 0.041 · change: 0.000

Affected products

Qemu
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

dkiser/vulners-yum-scanner

References

access.redhat.com/errata/RHSA-2017:1681 (vendor-advisory, Third Party Advisory)
www.openwall.com/lists/oss-security/2017/06/12/1 (mailing-list, Patch, Mailing List, Third Party Advisory)
access.redhat.com/errata/RHSA-2017:1682 (vendor-advisory, Third Party Advisory)
www.securityfocus.com/bid/99011 (VDB Entry, Third Party Advisory, vdb-entry)
lists.gnu.org/archive/html/qemu-devel/2017-05/msg06240.html (mailing-list, Patch, Third Party Advisory)
access.redhat.com/errata/RHSA-2017:2408 (vendor-advisory, Third Party Advisory)
www.debian.org/security/2017/dsa-3925 (vendor-advisory, Third Party Advisory)
lists.gnu.org/archive/html/qemu-devel/2017-06/msg02321.html (mailing-list, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2017-9524?: CVE-2017-9524 is a high-severity vulnerability in Qemu, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-07-06.
How severe is CVE-2017-9524?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2017-9524 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.