# CVE-2023-28450: Denial of service in n/a > Dnsmasq uses an excessive default EDNS.0 UDP packet size, potentially causing network fragmentation and denial of service. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 15 Mar 2023 - **Updated:** 3 Nov 2025 - **Also known as:** ALPINE-CVE-2023-28450, ALSA-2023:6524, ALSA-2023:7046, AZL-25660, CLEANSTART-2026-XT23079, CLSA-2024-1720179161, CLSA-2025-1744628407, DEBIAN-CVE-2023-28450, GHSA-vgrx-vhjf-p7wv, MGASA-2023-0153, RHSA-2023:6524, RHSA-2023:7046, RHSA-2024:4052, SUSE-SU-2023:1930-1, SUSE-SU-2023:2123-1, UBUNTU-CVE-2023-28450, USN-6034-1, openSUSE-SU-2024:12887-1 ## What is CVE-2023-28450? CVE-2023-28450 is a high-severity denial of service vulnerability in n/a, published on 15 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description 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. ## Which versions are affected by CVE-2023-28450? It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `dnsmasq` | AlmaLinux:8 | All versions | 2.79-31.el8 | | `dnsmasq-utils` | AlmaLinux:8 | All versions | 2.79-31.el8 | | `dnsmasq` | AlmaLinux:9 | All versions | 2.85-14.el9 | | `dnsmasq-utils` | AlmaLinux:9 | All versions | 2.85-14.el9 | | `dnsmasq` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-31.el8 | | `dnsmasq-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-31.el8 | | `dnsmasq-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-31.el8 | | `dnsmasq-utils` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-31.el8 | | `dnsmasq-utils-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:2.79-31.el8 | | `dnsmasq` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-14.el9 | | `dnsmasq-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-14.el9 | | `dnsmasq-debugsource` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-14.el9 | | `dnsmasq-utils` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-14.el9 | | `dnsmasq-utils-debuginfo` | Red Hat:enterprise_linux:9::appstream | All versions | 0:2.85-14.el9 | | `dnsmasq` | Red Hat:rhel_eus:9.2::appstream | All versions | 0:2.85-6.el9_2.4 | | `dnsmasq-debuginfo` | Red Hat:rhel_eus:9.2::appstream | All versions | 0:2.85-6.el9_2.4 | | `dnsmasq-debugsource` | Red Hat:rhel_eus:9.2::appstream | All versions | 0:2.85-6.el9_2.4 | | `dnsmasq-utils` | Red Hat:rhel_eus:9.2::appstream | All versions | 0:2.85-6.el9_2.4 | | `dnsmasq-utils-debuginfo` | Red Hat:rhel_eus:9.2::appstream | All versions | 0:2.85-6.el9_2.4 | | `dnsmasq` | SUSE:HPE Helion OpenStack 8 | All versions | 2.78-18.21.1 | | `dnsmasq` | SUSE:Linux Enterprise Micro 5.1 | All versions | 2.86-150100.7.23.1 | | `dnsmasq` | SUSE:Linux Enterprise Micro 5.2 | All versions | 2.86-150100.7.23.1 | | `dnsmasq` | SUSE:Linux Enterprise Real Time 15 SP3 | All versions | 2.86-150100.7.23.1 | | `dnsmasq` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.78-18.21.1 | | `dnsmasq` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.78-18.21.1 | | `dnsmasq` | SUSE:OpenStack Cloud 8 | All versions | 2.78-18.21.1 | | `dnsmasq` | SUSE:OpenStack Cloud 9 | All versions | 2.78-18.21.1 | | `dnsmasq` | SUSE:OpenStack Cloud Crowbar 8 | All versions | 2.78-18.21.1 | | `dnsmasq` | SUSE:OpenStack Cloud Crowbar 9 | All versions | 2.78-18.21.1 | | `dnsmasq` | openSUSE:Tumbleweed | All versions | 2.89-3.1 | Products: Thekelleys Dnsmasq. ## How do I fix CVE-2023-28450? Upgrade to a fixed version. ## Is CVE-2023-28450 being exploited? There is no known exploitation of CVE-2023-28450 in the wild and no public exploit code. ## Other vulnerabilities in n/a - [CVE-2021-45951](https://insights.sbomify.com/CVE-2021-45951/): Memory corruption in n/a (critical 9.8) - [CVE-2021-45952](https://insights.sbomify.com/CVE-2021-45952/): Memory corruption in n/a (critical 9.8) - [CVE-2021-45953](https://insights.sbomify.com/CVE-2021-45953/): Memory corruption in n/a (critical 9.8) - [CVE-2021-45954](https://insights.sbomify.com/CVE-2021-45954/): Memory corruption in n/a (critical 9.8) - [CVE-2021-45955](https://insights.sbomify.com/CVE-2021-45955/): Memory corruption in n/a (critical 9.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-28450 and fix it if it is affected. What it is: CVE-2023-28450 is a high-severity denial of service vulnerability in n/a, published on 15 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2023-28450 in the wild and no public exploit code. Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2023-28450/ (Markdown: https://insights.sbomify.com/CVE-2023-28450/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-28450 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-28450 - OSV: https://osv.dev/vulnerability/CVE-2023-28450 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-28450/ Summaries are generated and may contain mistakes; the official description above is the record.