CVE-2017-9524

Name: CVE-2017-9524
Creator: NVD / NIST
Published: 2017-07-06T16:29:00.467+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.13%

Last modified Jun 17, 2026

CVE-2017-9524 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 4.13% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

4.13%

89.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Qemu	Qemu	<= 2.9.1
Debian	Debian Linux	9.0

References

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

Timeline

Published: Jul 6, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-9524?

How severe is CVE-2017-9524?

CVE-2017-9524 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.13% probability of exploitation in the next 30 days.

How do I fix CVE-2017-9524?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-9524?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST