CVE-2017-9524

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-07-06 · updated 2026-06-17
Weakness: CWE-20

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.

Affected products

Debian Linux: 9.0
QEMU: through 2.9.1

References

http://www.debian.org/security/2017/dsa-3925
http://www.openwall.com/lists/oss-security/2017/06/12/1
http://www.securityfocus.com/bid/99011
https://access.redhat.com/errata/RHSA-2017:1681
https://access.redhat.com/errata/RHSA-2017:1682
https://access.redhat.com/errata/RHSA-2017:2408
https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg06240.html
https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg02321.html
http://www.debian.org/security/2017/dsa-3925
http://www.openwall.com/lists/oss-security/2017/06/12/1
http://www.securityfocus.com/bid/99011
https://access.redhat.com/errata/RHSA-2017:1681

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