CVE-2017-7539
This could crash the qemu-nbd server if a client sent unexpected data during connection negotiation.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An assertion-failure flaw was found in Qemu before 2.10.1, in the Network Block Device (NBD) server's initial connection negotiation, where the I/O coroutine was undefined. This could crash the qemu-nbd server if a client sent unexpected data during connection negotiation. A remote user or process could use this flaw to crash the qemu-nbd server resulting in denial of service.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 5.46% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-617, CWE-20
- Affected
- qemu/qemu · redhat/openstack · redhat/virtualization
- Source
- secalert@redhat.com
EPSS 5.5% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2017/07/21/4Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/99944Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:2628Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3466Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3470Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3471Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3472Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3473Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3474Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7539Issue Tracking, Patch, Third Party Advisory
- https://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=2b0bbc4f8809c972bad134bc1a2570dbb01dea0b
- https://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=ff82911cd3f69f028f2537825c9720ff78bc3f19
- http://www.openwall.com/lists/oss-security/2017/07/21/4Mailing List, Patch, Third Party Advisory
- http://www.securityfocus.com/bid/99944Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:2628Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3466Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3470Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3471Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3472Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3473Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3474Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7539Issue Tracking, Patch, Third Party Advisory
- https://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=2b0bbc4f8809c972bad134bc1a2570dbb01dea0b
- https://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=ff82911cd3f69f028f2537825c9720ff78bc3f19
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.