# CVE-2020-13645: Security feature bypass in n/a > Applications using glib-networking may accept invalid TLS certificates if server identity is not specified, allowing man-in-the-middle attacks. - **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:** 28 May 2020 - **Updated:** 4 Aug 2024 - **Also known as:** AZL-6440, CLEANSTART-2024-CH43456, DEBIAN-CVE-2020-13645, GHSA-p43h-5x4h-9pp7, MGASA-2020-0314, SUSE-SU-2021:3944-1, SUSE-SU-2021:3997-1, SUSE-SU-2021:4004-1, UBUNTU-CVE-2020-13645, USN-4405-1, openSUSE-SU-2021:1094-1, openSUSE-SU-2021:1554-1, openSUSE-SU-2021:3944-1, openSUSE-SU-2024:10790-1 ## What is CVE-2020-13645? CVE-2020-13645 is a medium-severity vulnerability in Broadcom Fabric Operating System, published on 28 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its intended documented behavior, to fail the certificate verification. Applications that fail to provide the server identity, including Balsa before 2.5.11 and 2.6.x before 2.6.1, accept a TLS certificate if the certificate is valid for any host. Weakness: CWE-295 (Improper Certificate Validation) ## Which versions are affected by CVE-2020-13645? It affects 6 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `glib-networking` | SUSE:Enterprise Storage 6 | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:HPE Helion OpenStack 8 | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:Linux Enterprise Micro 5.0 | All versions | 2.62.4-3.3.1 | | `glib-networking` | SUSE:Linux Enterprise Micro 5.1 | All versions | 2.62.4-3.3.1 | | `glib-networking` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 2.62.4-3.3.1 | | `glib-networking` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 2.62.4-3.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server 12 SP4-LTSS | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server 15 SP1-BCL | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:Linux Enterprise Server 15 SP1-LTSS | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:Linux Enterprise Server 15-LTSS | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:Linux Enterprise Server for SAP Applications 15 | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:Linux Enterprise Server for SAP Applications 15 SP1 | All versions | 2.54.1-3.6.1 | | `glib-networking` | SUSE:OpenStack Cloud 8 | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:OpenStack Cloud 9 | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:OpenStack Cloud Crowbar 8 | All versions | 2.48.2-6.3.1 | | `glib-networking` | SUSE:OpenStack Cloud Crowbar 9 | All versions | 2.48.2-6.3.1 | | `balsa` | SUSE:Package Hub 15 SP2 | All versions | 2.6.1-bp153.2.3.1 | | `balsa` | SUSE:Package Hub 15 SP3 | All versions | 2.6.1-bp153.2.3.1 | | `balsa` | openSUSE:Leap 15.2 | All versions | 2.6.1-bp153.2.3.1 | | `glib-networking` | openSUSE:Leap 15.2 | All versions | 2.62.4-lp152.2.3.1 | | `balsa` | openSUSE:Leap 15.3 | All versions | 2.6.1-bp153.2.3.1 | | `glib-networking` | openSUSE:Leap 15.3 | All versions | 2.62.4-3.3.1 | | `glib-networking` | openSUSE:Tumbleweed | All versions | 2.68.1-1.3 | Products: Broadcom Fabric Operating System, Canonical Ubuntu Linux, Fedoraproject Fedora, Gnome Balsa, Gnome Glib-Networking, Netapp Cloud Backup. ## How do I fix CVE-2020-13645? Upgrade to a fixed version. ## Is CVE-2020-13645 being exploited? There is no known exploitation of CVE-2020-13645 in the wild and no public exploit code. ## Other vulnerabilities in Broadcom Fabric Operating System - [CVE-2025-1976](https://insights.sbomify.com/CVE-2025-1976/): Broadcom Brocade Fabric OS Code Injection (high 8.6, exploited in the wild) - [CVE-2021-22555](https://insights.sbomify.com/CVE-2021-22555/): Linux Kernel Heap Out-of-Bounds Write (high 8.3, exploited in the wild) - [CVE-2022-33186](https://insights.sbomify.com/CVE-2022-33186/): Command injection in Brocade Fabric OS (critical 9.8) - [CVE-2021-27797](https://insights.sbomify.com/CVE-2021-27797/): Hardcoded credentials in Brocade Fabric OS (critical 9.8) - [CVE-2020-15371](https://insights.sbomify.com/CVE-2020-15371/): Code injection in Brocade Fabric OS (critical 9.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2020-13645 and fix it if it is affected. What it is: CVE-2020-13645 is a medium-severity vulnerability in Broadcom Fabric Operating System, published on 28 May 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-2020-13645 in the wild and no public exploit code. Affected product: Broadcom Fabric Operating System. 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-2020-13645/ (Markdown: https://insights.sbomify.com/CVE-2020-13645/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13645 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13645 - OSV: https://osv.dev/vulnerability/CVE-2020-13645 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-13645/ Summaries are generated and may contain mistakes; the official description above is the record.