# CVE-2020-12049: Denial of service in n/a > A local attacker can exhaust file descriptors in D-Bus services by sending oversized messages, causing denial of service for other clients. - **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 8 Jun 2020 - **Updated:** 4 Aug 2024 - **Also known as:** ALPINE-CVE-2020-12049, DEBIAN-CVE-2020-12049, DLA-2235-1, JLSEC-2025-18, MGASA-2020-0262, RHSA-2020:2894, RHSA-2020:3014, RHSA-2020:3044, RHSA-2020:3298, SUSE-SU-2021:2470-1, SUSE-SU-2021:2810-1, UBUNTU-CVE-2020-12049, USN-4398-1, USN-4398-2, openSUSE-SU-2021:1204-1, openSUSE-SU-2021:2810-1 ## What is CVE-2020-12049? CVE-2020-12049 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 8 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description An issue was discovered in dbus >= 1.3.0 before 1.12.18. The DBusServer in libdbus, as used in dbus-daemon, leaks file descriptors when a message exceeds the per-message file descriptor limit. A local attacker with access to the D-Bus system bus or another system service's private AF_UNIX socket could use this to make the system service reach its file descriptor limit, denying service to subsequent D-Bus clients. Weakness: CWE-404 (Improper Resource Shutdown or Release) ## Which versions are affected by CVE-2020-12049? It affects 2 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `dbus` | Red Hat:enterprise_linux:7::client | All versions | 1:1.10.24-14.el7_8 | | `dbus-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 1:1.10.24-14.el7_8 | | `dbus-devel` | Red Hat:enterprise_linux:7::client | All versions | 1:1.10.24-14.el7_8 | | `dbus-doc` | Red Hat:enterprise_linux:7::client | All versions | 1:1.10.24-14.el7_8 | | `dbus-libs` | Red Hat:enterprise_linux:7::client | All versions | 1:1.10.24-14.el7_8 | | `dbus-tests` | Red Hat:enterprise_linux:7::client | All versions | 1:1.10.24-14.el7_8 | | `dbus-x11` | Red Hat:enterprise_linux:7::client | All versions | 1:1.10.24-14.el7_8 | | `dbus` | Red Hat:enterprise_linux:7::computenode | All versions | 1:1.10.24-14.el7_8 | | `dbus-debuginfo` | Red Hat:enterprise_linux:7::computenode | All versions | 1:1.10.24-14.el7_8 | | `dbus-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 1:1.10.24-14.el7_8 | | `dbus-doc` | Red Hat:enterprise_linux:7::computenode | All versions | 1:1.10.24-14.el7_8 | | `dbus-libs` | Red Hat:enterprise_linux:7::computenode | All versions | 1:1.10.24-14.el7_8 | | `dbus-tests` | Red Hat:enterprise_linux:7::computenode | All versions | 1:1.10.24-14.el7_8 | | `dbus-x11` | Red Hat:enterprise_linux:7::computenode | All versions | 1:1.10.24-14.el7_8 | | `dbus` | Red Hat:enterprise_linux:7::server | All versions | 1:1.10.24-14.el7_8 | | `dbus-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 1:1.10.24-14.el7_8 | | `dbus-devel` | Red Hat:enterprise_linux:7::server | All versions | 1:1.10.24-14.el7_8 | | `dbus-doc` | Red Hat:enterprise_linux:7::server | All versions | 1:1.10.24-14.el7_8 | | `dbus-libs` | Red Hat:enterprise_linux:7::server | All versions | 1:1.10.24-14.el7_8 | | `dbus-tests` | Red Hat:enterprise_linux:7::server | All versions | 1:1.10.24-14.el7_8 | | `dbus-x11` | Red Hat:enterprise_linux:7::server | All versions | 1:1.10.24-14.el7_8 | | `dbus` | Red Hat:enterprise_linux:7::workstation | All versions | 1:1.10.24-14.el7_8 | | `dbus-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 1:1.10.24-14.el7_8 | | `dbus-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 1:1.10.24-14.el7_8 | | `dbus-doc` | Red Hat:enterprise_linux:7::workstation | All versions | 1:1.10.24-14.el7_8 | | `dbus-libs` | Red Hat:enterprise_linux:7::workstation | All versions | 1:1.10.24-14.el7_8 | | `dbus-tests` | Red Hat:enterprise_linux:7::workstation | All versions | 1:1.10.24-14.el7_8 | | `dbus-x11` | Red Hat:enterprise_linux:7::workstation | All versions | 1:1.10.24-14.el7_8 | | `dbus-daemon-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus-devel` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus-libs-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus-tests-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus-tools-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus-x11` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus-x11-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.12.8-10.el8_2 | | `dbus` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.12.8-10.el8_2 | | `dbus-common` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.12.8-10.el8_2 | | `dbus-daemon` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.12.8-10.el8_2 | Products: Canonical Ubuntu Linux, Freedesktop Dbus. ## How do I fix CVE-2020-12049? Upgrade to a fixed version. ## Is CVE-2020-12049 being exploited? There is no known exploitation of CVE-2020-12049 in the wild and no public exploit code. ## Other vulnerabilities in Canonical Ubuntu Linux - [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild) - [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2020-12049 and fix it if it is affected. What it is: CVE-2020-12049 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 8 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2020-12049 in the wild and no public exploit code. Affected product: Canonical Ubuntu Linux. 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-2020-12049/ (Markdown: https://insights.sbomify.com/CVE-2020-12049/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-12049 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-12049 - OSV: https://osv.dev/vulnerability/CVE-2020-12049 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-12049/ Summaries are generated and may contain mistakes; the official description above is the record.