# CVE-2019-15892: Denial of service in n/a > Remote attackers can cause a Denial of Service in Varnish Cache by sending crafted HTTP/1 requests that trigger an assertion failure and automatic restart. - **Severity:** High 7.5 (`CVSS:3.0/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:** 3 Sep 2019 - **Updated:** 5 Aug 2024 - **Also known as:** ALPINE-CVE-2019-15892, DEBIAN-CVE-2019-15892, DSA-4514-1, GHSA-3775-frgh-j3vc, OESA-2021-1032, RHEA-2020:2262, openSUSE-SU-2019:2184-1, openSUSE-SU-2019:2221-1, openSUSE-SU-2024:11493-1 ## What is CVE-2019-15892? CVE-2019-15892 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 3 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description An issue was discovered in Varnish Cache before 6.0.4 LTS, and 6.1.x and 6.2.x before 6.2.1. An HTTP/1 parsing failure allows a remote attacker to trigger an assert by sending crafted HTTP/1 requests. The assert will cause an automatic restart with a clean cache, which makes it a Denial of Service attack. Weakness: CWE-617 (Reachable Assertion) ## Which versions are affected by CVE-2019-15892? It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `rh-varnish6` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:4.1-6.el7 | | `rh-varnish6-runtime` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:4.1-6.el7 | | `rh-varnish6-scldevel` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:4.1-6.el7 | | `rh-varnish6-varnish` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:6.0.6-1.el7 | | `rh-varnish6-varnish-devel` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:6.0.6-1.el7 | | `rh-varnish6-varnish-docs` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:6.0.6-1.el7 | | `rh-varnish6-varnish-libs` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:6.0.6-1.el7 | | `rh-varnish6-varnish-modules` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:0.15.0-6.el7 | | `rh-varnish6-varnish-modules-debuginfo` | Red Hat:rhel_software_collections:3::el7 | All versions | 0:0.15.0-6.el7 | | `varnish` | SUSE:Package Hub 15 | All versions | 6.2.1-bp151.4.3.1 | | `varnish` | SUSE:Package Hub 15 SP1 | All versions | 6.2.1-bp151.4.3.1 | | `varnish` | openSUSE:Leap 15.0 | All versions | 6.2.1-lp151.3.3.1 | | `varnish` | openSUSE:Leap 15.1 | All versions | 6.2.1-lp151.3.3.1 | | `varnish` | openSUSE:Tumbleweed | All versions | 6.6.1-1.2 | Products: Debian Debian Linux, Varnish-Software Varnish Cache, Varnish Cache Project Varnish Cache. ## How do I fix CVE-2019-15892? Upgrade to a fixed version. ## Is CVE-2019-15892 being exploited? There is no known exploitation of CVE-2019-15892 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-2019-15892 and fix it if it is affected. What it is: CVE-2019-15892 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 3 Sep 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-2019-15892 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-2019-15892/ (Markdown: https://insights.sbomify.com/CVE-2019-15892/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-15892 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-15892 - OSV: https://osv.dev/vulnerability/CVE-2019-15892 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-15892/ Summaries are generated and may contain mistakes; the official description above is the record.