CVE-2018-17963

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply 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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
51(Track)
EG Risk 51/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
91.0%
KEV
Not listed

Published

October 9, 2018

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Jun 13, 2026
Patch available. Sources: redhat.
generic

oss-security - Qemu: integer overflow issues

http://www.openwall.com/lists/oss-security/2018/10/08/1
generic

[SECURITY] [DSA 4338-1] qemu security update

https://www.debian.org/security/2018/dsa-4338
generic

[Qemu-devel] [PATCH for 3.1 0/4] Fix possible OOB during queuing packets

https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg06054.html
generic

[Qemu-devel] [PULL 24/25] net: ignore packet size greater than INT_MAX

https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg03267.html
generic Patch Available

[SECURITY] [DLA 1599-1] qemu security update

https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
redhat Patch Available

Affected: Red Hat Enterprise Linux 7 and Red Hat Virtualization Engine 4.3.

https://access.redhat.com/errata/RHSA-2019:2553
redhat Patch Available
https://access.redhat.com/errata/RHSA-2019:2425
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2019:2166

Vendor Advisories for CVE-2018-17963(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuqemu-utils (1:2.5+dfsg-5ubuntu10.33) @ xenial2026-05-28ubuntu
redhatqemu-kvm-rhev-10:2.12.0-33.el72019-08-22redhat
redhatqemu-kvm-ma-10:2.12.0-33.el72019-08-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-07-23 01:34 UTCEG score recompute
  2. 2026-07-22 22:14 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
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  69. 2026-05-28 02:20 UTCVendor advisory
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Frequently asked(5)

What is CVE-2018-17963?
CVE-2018-17963 is a critical vulnerability published on October 9, 2018. qemudeliverpacketiov in net/net.c in Qemu accepts packet sizes greater than INTMAX, which allows attackers to cause a denial of service or possibly have unspecified other impact.
When was CVE-2018-17963 disclosed?
CVE-2018-17963 was first published in the National Vulnerability Database on October 9, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-17963 actively exploited?
CVE-2018-17963 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-17963?
CVE-2018-17963 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-17963?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-17963, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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