# CVE-2019-3883: Denial of service in 389-ds-base > An unauthenticated attacker can cause a Denial of Service in 389-ds-base by exploiting missing timeouts on SSL/TLS connections to exhaust worker threads. - **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 17 Apr 2019 - **Updated:** 4 Aug 2024 - **Also known as:** DEBIAN-CVE-2019-3883, DLA-1779-1, GHSA-c65q-p9xj-798w, RHSA-2019:1896, UBUNTU-CVE-2019-3883 ## What is CVE-2019-3883? CVE-2019-3883 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 17 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description In 389-ds-base up to version 1.4.1.2, requests are handled by workers threads. Each sockets will be waited by the worker for at most 'ioblocktimeout' seconds. However this timeout applies only for un-encrypted requests. Connections using SSL/TLS are not taking this timeout into account during reads, and may hang longer.An unauthenticated attacker could repeatedly create hanging LDAP requests to hang all the workers, resulting in a Denial of Service. Weakness: CWE-772 (Missing Release of Resource after Effective Lifetime) ## Which versions are affected by CVE-2019-3883? It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `389-ds-base` | Red Hat:enterprise_linux:7::client | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-libs` | Red Hat:enterprise_linux:7::client | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-snmp` | Red Hat:enterprise_linux:7::client | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base` | Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-debuginfo` | Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-libs` | Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-snmp` | Red Hat:enterprise_linux:7::computenode | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base` | Red Hat:enterprise_linux:7::server | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-libs` | Red Hat:enterprise_linux:7::server | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-snmp` | Red Hat:enterprise_linux:7::server | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-libs` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.8.4-25.1.el7_6 | | `389-ds-base-snmp` | Red Hat:enterprise_linux:7::workstation | All versions | 0:1.3.8.4-25.1.el7_6 | Products: Debian Debian Linux, Fedoraproject 389 Directory Server, Redhat Enterprise Linux. ## How do I fix CVE-2019-3883? Apply the vendor's patch. ## Is CVE-2019-3883 being exploited? There is no known exploitation of CVE-2019-3883 in the wild and no public exploit code. ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2019-3883 and fix it if it is affected. What it is: CVE-2019-3883 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 17 Apr 2019. 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-2019-3883 in the wild and no public exploit code. Affected product: Debian Debian 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-2019-3883/ (Markdown: https://insights.sbomify.com/CVE-2019-3883/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3883 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3883 - OSV: https://osv.dev/vulnerability/CVE-2019-3883 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-3883/ Summaries are generated and may contain mistakes; the official description above is the record.