An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.
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Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2023-03-15. NVD baseline CVSS 7.5; sources differ by 0.0.
A fix is available — apply it.
An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.
March 15, 2023
November 3, 2025
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | dnsmasq-base (2.79-1ubuntu0.16.04.1+esm2) @ xenial | 2026-05-25 | ubuntu |
| ubuntu | dnsmasq-utils (2.90-0ubuntu0.16.04.1+esm1) @ xenial | 2026-05-25 | ubuntu |
| ubuntu | dnsmasq-utils (2.90-0ubuntu0.22.04.1) @ jammy | 2026-05-25 | ubuntu |
| redhat | dnsmasq-0:2.85-6.el9_2.4 | 2024-06-23 | redhat |
| redhat | dnsmasq-0:2.79-21.el8_6.5 | 2024-03-27 | redhat |
| redhat | dnsmasq-0:2.79-26.el8_8.4 | 2024-03-27 | redhat |
| redhat | dnsmasq-0:2.79-31.el8 | 2023-11-14 | redhat |
| redhat | dnsmasq-0:2.85-14.el9 | 2023-11-07 | redhat |
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.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
An issue was discovered in Dnsmasq before 2.90. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.
RHSA-2023:6524 — Moderate
RHSA-2023:7046 — Moderate
RHSA-2024:1544 — Moderate
RHSA-2024:1545 — Moderate
RHSA-2024:4052 — Moderate
Dnsmasq vulnerability
Dnsmasq vulnerabilities
Dnsmasq vulnerabilities
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.
Explore the affected products and dependency analysis for CVE-2023-28450
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