# CVE-2019-20372: Other in n/a > Attackers can perform HTTP request smuggling to read unauthorized web pages when NGINX uses specific error_page configurations behind a load balancer. - **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 9 Jan 2020 - **Updated:** 5 Aug 2024 - **Also known as:** ALPINE-CVE-2019-20372, CLEANSTART-2026-OM02824, DEBIAN-CVE-2019-20372, GHSA-c9vh-3f9g-f2xf, MGASA-2020-0231, RHSA-2020:2817, RHSA-2020:5495, SUSE-SU-2020:0348-1, SUSE-SU-2020:1171-1, UBUNTU-CVE-2019-20372, USN-4235-1, USN-4235-2, openSUSE-SU-2020:0204-1 ## What is CVE-2019-20372? CVE-2019-20372 is a medium-severity vulnerability in Apple Xcode, published on 9 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description NGINX before 1.17.7, with certain error_page configurations, allows HTTP request smuggling, as demonstrated by the ability of an attacker to read unauthorized web pages in environments where NGINX is being fronted by a load balancer. Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests) ## Which versions are affected by CVE-2019-20372? It affects 5 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `nginx` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-all-modules` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-filesystem` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-http-image-filter` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-http-image-filter-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-http-perl` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-http-perl-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-http-xslt-filter` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-http-xslt-filter-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-mail` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-mail-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-stream` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `nginx-mod-stream-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.16.1-1.module+el8.3.0+8844+e5e7039f.1 | | `rh-nginx116-nginx` | Red Hat:rhel_software_collections:3::el7 | All versions | 1:1.16.1-4.el7.1 | | `rh-nginx116-nginx-debuginfo` | Red Hat:rhel_software_collections:3::el7 | All versions | 1:1.16.1-4.el7.1 | | `rh-nginx116-nginx-mod-http-image-filter` | Red Hat:rhel_software_collections:3::el7 | All versions | 1:1.16.1-4.el7.1 | | `rh-nginx116-nginx-mod-http-perl` | Red Hat:rhel_software_collections:3::el7 | All versions | 1:1.16.1-4.el7.1 | | `rh-nginx116-nginx-mod-http-xslt-filter` | Red Hat:rhel_software_collections:3::el7 | All versions | 1:1.16.1-4.el7.1 | | `rh-nginx116-nginx-mod-mail` | Red Hat:rhel_software_collections:3::el7 | All versions | 1:1.16.1-4.el7.1 | | `rh-nginx116-nginx-mod-stream` | Red Hat:rhel_software_collections:3::el7 | All versions | 1:1.16.1-4.el7.1 | | `nginx` | SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 1.16.1-3.12.7 | | `nginx` | SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 1.16.1-3.12.7 | | `nginx` | SUSE:Linux Enterprise Module for Server Applications 15 SP1 | All versions | 1.14.2-6.7.1 | | `nginx` | SUSE:Linux Enterprise Server 15-LTSS | All versions | 1.16.1-3.12.7 | | `nginx` | SUSE:Linux Enterprise Server for SAP Applications 15 | All versions | 1.16.1-3.12.7 | | `nginx` | openSUSE:Leap 15.1 | All versions | 1.14.2-lp151.4.6.1 | Products: Apple Xcode, Canonical Ubuntu Linux, F5 Nginx, Netapp Cloud Backup, Opensuse Leap. ## How do I fix CVE-2019-20372? Upgrade to a fixed version. ## Is CVE-2019-20372 being exploited? There is no known exploitation of CVE-2019-20372 in the wild and no public exploit code. Public exploit code: - nginx http request smugling error_page directive (github_poc): https://github.com/0xleft/CVE-2019-20372 - Nginx CVE-2019-20372 PoC, Unauthenticated File Upload Exploit (github_poc): https://github.com/moften/CVE-2019-20372 - https://github.com/vuongnv3389-sec/CVE-2019-20372 (github_poc): https://github.com/vuongnv3389-sec/CVE-2019-20372 ## Other vulnerabilities in Apple Xcode - [CVE-2025-48384](https://insights.sbomify.com/CVE-2025-48384/): Git Link Following (high 8.1, exploited in the wild) - [CVE-2014-9390](https://insights.sbomify.com/CVE-2014-9390/): JGit Improper Input Validation vulnerability (critical 9.8) - [CVE-2019-14379](https://insights.sbomify.com/CVE-2019-14379/): Deserialization of untrusted data in FasterXML jackson-databind (critical 9.8) - [CVE-2018-4164](https://insights.sbomify.com/CVE-2018-4164/): An issue was discovered in certain Apple products. (critical 9.8) - [CVE-2016-0746](https://insights.sbomify.com/CVE-2016-0746/): Use after free in n/a (critical 9.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2019-20372 and fix it if it is affected. What it is: CVE-2019-20372 is a medium-severity vulnerability in Apple Xcode, published on 9 Jan 2020. 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-2019-20372 in the wild and no public exploit code. Affected product: Apple Xcode. 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-2019-20372/ (Markdown: https://insights.sbomify.com/CVE-2019-20372/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20372 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20372 - OSV: https://osv.dev/vulnerability/CVE-2019-20372 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-20372/ Summaries are generated and may contain mistakes; the official description above is the record.