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CVE-2018-17963· NVD / CVE Program· CNA mitre

qemu_deliver_packet_iov in net/net.c in Qemu accepts packet sizes greater than INT_MAX, which allows attackers to cause a denial of service

Noroxi assessment

Priority: Plan (action score 40/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 4.6% (FIRST EPSS); higher than 91.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: qemu (Debian:12) 1:3.1+dfsg-1; qemu (Debian:9) 1:2.8+dfsg-6+deb9u5; qemu-img-ma (Red Hat:enterprise_linux:7::server) 10:2.12.0-33.el7.

Add it to your regular patch cycle. Upgrade to qemu (Debian:12) 1:3.1+dfsg-1; qemu (Debian:9) 1:2.8+dfsg-6+deb9u5; qemu-img-ma (Red Hat:enterprise_linux:7::server) 10:2.12.0-33.el7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

qemu_deliver_packet_iov in net/net.c in Qemu accepts packet sizes greater than INT_MAX, which allows attackers to cause a denial of service or possibly have unspecified other impact.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Oct 9, 2018
Updated
Jun 16, 2026
EPSS
4.7% · 92th percentile

Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 4.7%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2018-17963

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
qemuqemu
debiandebian linux
canonicalubuntu linux
redhatopenstack
redhatvirtualization
redhatvirtualization manager

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux18.10
  • debian debian linux8.0
  • debian debian linux9.0
  • qemu qemuup to 3.0.0 inclusive
  • qemu qemu3.1.0
  • redhat openstack10
  • redhat openstack13
  • redhat openstack14
  • redhat virtualization4.0
  • redhat virtualization manager4.3

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12qemubefore 1:3.1+dfsg-11:3.1+dfsg-1
Debian:9qemubefore 1:2.8+dfsg-6+deb9u51:2.8+dfsg-6+deb9u5
Red Hat:enterprise_linux:7::serverqemu-img-mabefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:enterprise_linux:7::serverqemu-kvm-common-mabefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:enterprise_linux:7::serverqemu-kvm-mabefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:enterprise_linux:7::serverqemu-kvm-ma-debuginfobefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:enterprise_linux:7::serverqemu-kvm-tools-mabefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:openstack:10::el7qemu-img-rhevbefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:openstack:10::el7qemu-kvm-common-rhevbefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:openstack:10::el7qemu-kvm-rhevbefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:openstack:10::el7qemu-kvm-rhev-debuginfobefore 10:2.12.0-33.el710:2.12.0-33.el7
Red Hat:openstack:10::el7qemu-kvm-tools-rhevbefore 10:2.12.0-33.el710:2.12.0-33.el7
SUSE:Linux Enterprise Desktop 12 SP3qemubefore 2.9.1-6.22.32.9.1-6.22.3
SUSE:Linux Enterprise Desktop 12 SP3xenbefore 4.9.3_03-3.44.24.9.3_03-3.44.2
SUSE:Linux Enterprise Desktop 12 SP4qemubefore 2.11.2-5.5.12.11.2-5.5.1
SUSE:Linux Enterprise Desktop 12 SP4xenbefore 4.11.1_02-2.3.14.11.1_02-2.3.1
SUSE:Linux Enterprise Module for Basesystem 15qemubefore 2.11.2-9.12.22.11.2-9.12.2
SUSE:Linux Enterprise Point of Sale 11 SP3kvmbefore 1.4.2-53.26.21.4.2-53.26.2
SUSE:Linux Enterprise Point of Sale 11 SP3xenbefore 4.2.5_21-45.30.14.2.5_21-45.30.1
SUSE:Linux Enterprise Server 11 SP4kvmbefore 1.4.2-60.18.21.4.2-60.18.2
SUSE:Linux Enterprise Server 12 SP1-LTSSqemubefore 2.3.1-33.17.12.3.1-33.17.1
SUSE:Linux Enterprise Server 12-LTSSqemubefore 2.0.2-48.46.22.0.2-48.46.2
SUSE:Linux Enterprise Server 12-LTSSxenbefore 4.4.4_40-22.77.14.4.4_40-22.77.1
SUSE:Linux Enterprise Server for SAP Applications 12 SP1xenbefore 4.5.5_28-22.58.14.5.5_28-22.58.1

+3

Same product

qemu: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-12928The QMP migrate command in QEMU version 4.0.0 and earlier is vulnerable to OS command injection, which allows the remote attacker to achieve
    46Plan
  • CVE-2015-8556Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
    44Plan
  • CVE-2017-15118A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu before 2.11 allowing a client to request an expor
    43Plan
  • CVE-2022-36648The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier, allows remote attackers
    41Plan
  • CVE-2017-16845hw/input/ps2.c in Qemu does not validate 'rptr' and 'count' values during guest migration, leading to out-of-bounds access.
    41Plan
  • CVE-2016-7161Heap-based buffer overflow in the .receive callback of xlnx.xps-ethernetlite in QEMU (aka Quick Emulator) allows attackers to execute arbitr
    41Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:qemu1:3.1+dfsg-1 · Debian:12Package registry (OSV)
red hat:qemu-img-ma10:2.12.0-33.el7 · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:qemu-img-rhev10:2.12.0-33.el7 · Red Hat:openstack:10::el7Package registry (OSV)
red hat:qemu-kvm-common-ma10:2.12.0-33.el7 · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:qemu-kvm-common-rhev10:2.12.0-33.el7 · Red Hat:openstack:10::el7Package registry (OSV)
red hat:qemu-kvm-ma10:2.12.0-33.el7 · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:qemu-kvm-ma-debuginfo10:2.12.0-33.el7 · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:qemu-kvm-rhev10:2.12.0-33.el7 · Red Hat:openstack:10::el7Package registry (OSV)
red hat:qemu-kvm-rhev-debuginfo10:2.12.0-33.el7 · Red Hat:openstack:10::el7Package registry (OSV)
red hat:qemu-kvm-tools-ma10:2.12.0-33.el7 · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:qemu-kvm-tools-rhev10:2.12.0-33.el7 · Red Hat:openstack:10::el7Package registry (OSV)
suse:kvm1.4.2-60.18.2 · SUSE:Linux Enterprise Server 11 SP4Package registry (OSV)
suse:qemu2.0.2-48.46.2 · SUSE:Linux Enterprise Server 12-LTSSPackage registry (OSV)
suse:xen4.7.6_05-43.42.1 · SUSE:OpenStack Cloud 7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records