# CVE-2021-3979: Weak cryptography in ceph > Attackers can exploit weak encryption keys in Ceph Storage to compromise the confidentiality and integrity of encrypted disks. - **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:** 25 Aug 2022 - **Updated:** 3 Nov 2025 - **Also known as:** DEBIAN-CVE-2021-3979, GHSA-23g5-cwwr-8xhw, MGASA-2022-0138, OESA-2022-1528, SUSE-SU-2022:2817-1, SUSE-SU-2022:2818-1, SUSE-SU-2022:4501-1, UBUNTU-CVE-2021-3979, openSUSE-SU-2024:12195-1 ## What is CVE-2021-3979? CVE-2021-3979 is a medium-severity vulnerability in Fedoraproject Fedora, published on 25 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A key length flaw was found in Red Hat Ceph Storage. An attacker can exploit the fact that the key length is incorrectly passed in an encryption algorithm to create a non random key, which is weaker and can be exploited for loss of confidentiality and integrity on encrypted disks. Weakness: CWE-287 (Improper Authentication), CWE-327 (Use of a Broken or Risky Cryptographic Algorithm) ## Which versions are affected by CVE-2021-3979? It affects 7 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `ceph` | SUSE:Enterprise Storage 7.1 | All versions | 16.2.9.536+g41a9f9a5573-150300.3.3.1 | | `ceph` | SUSE:Linux Enterprise Micro 5.1 | All versions | 16.2.9.536+g41a9f9a5573-150300.6.3.1 | | `fmt` | SUSE:Linux Enterprise Micro 5.1 | All versions | 8.0.1-150300.7.5.1 | | `ceph` | SUSE:Linux Enterprise Micro 5.2 | All versions | 16.2.9.536+g41a9f9a5573-150300.6.3.1 | | `fmt` | SUSE:Linux Enterprise Micro 5.2 | All versions | 8.0.1-150300.7.5.1 | | `ceph` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 16.2.9.536+g41a9f9a5573-150300.6.3.1 | | `fmt` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 8.0.1-150300.7.5.1 | | `ceph` | SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 16.2.9.536+g41a9f9a5573-150400.3.3.1 | | `ceph` | openSUSE:Leap 15.3 | All versions | 16.2.9.536+g41a9f9a5573-150300.6.3.1 | | `ceph-test` | openSUSE:Leap 15.3 | All versions | 16.2.9.536+g41a9f9a5573-150300.6.3.1 | | `fmt` | openSUSE:Leap 15.3 | All versions | 8.0.1-150300.7.5.1 | | `ceph` | openSUSE:Leap 15.4 | All versions | 16.2.9.536+g41a9f9a5573-150400.3.3.1 | | `ceph-test` | openSUSE:Leap 15.4 | All versions | 16.2.9.536+g41a9f9a5573-150400.3.3.1 | | `ceph` | openSUSE:Leap Micro 5.2 | All versions | 16.2.9.536+g41a9f9a5573-150300.6.3.1 | | `fmt` | openSUSE:Leap Micro 5.2 | All versions | 8.0.1-150300.7.5.1 | | `ceph` | openSUSE:Tumbleweed | All versions | 16.2.9.536+g41a9f9a5573-1.1 | Products: Fedoraproject Fedora, Redhat Ceph Storage, Redhat Ceph Storage for Ibm Z Systems, Redhat Ceph Storage for Power, Redhat Openshift Container Storage, Redhat Openshift Data Foundation, Redhat Openstack Platform. ## How do I fix CVE-2021-3979? Apply the vendor's patch. ## Is CVE-2021-3979 being exploited? There is no known exploitation of CVE-2021-3979 in the wild and no public exploit code. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-3979 and fix it if it is affected. What it is: CVE-2021-3979 is a medium-severity vulnerability in Fedoraproject Fedora, published on 25 Aug 2022. 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-2021-3979 in the wild and no public exploit code. Affected product: Fedoraproject Fedora. 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-2021-3979/ (Markdown: https://insights.sbomify.com/CVE-2021-3979/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3979 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3979 - OSV: https://osv.dev/vulnerability/CVE-2021-3979 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-3979/ Summaries are generated and may contain mistakes; the official description above is the record.