# CVE-2020-25648: A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Fix available:** Yes - **Published:** 20 Oct 2020 - **Updated:** 4 Aug 2024 - **Also known as:** ALPINE-CVE-2020-25648, ALSA-2021:3572, CLSA-2025-1760106204, CLSA-2025-1760112150, DEBIAN-CVE-2020-25648, GHSA-43j5-76vw-pq2j, RHSA-2021:1384, RHSA-2021:3572, RLSA-2021:3572, UBUNTU-CVE-2020-25648, USN-5410-1 ## What is CVE-2020-25648? CVE-2020-25648 is a high-severity vulnerability in Fedoraproject Fedora, published on 20 Oct 2020. ### Official description A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58. Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling) ## Which versions are affected by CVE-2020-25648? It affects 6 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `nspr` | AlmaLinux:8 | All versions | 4.32.0-1.el8_4 | | `nspr-devel` | AlmaLinux:8 | All versions | 4.32.0-1.el8_4 | | `nss` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-devel` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-softokn` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-softokn-devel` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-softokn-freebl` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-softokn-freebl-devel` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-sysinit` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-tools` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-util` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss-util-devel` | AlmaLinux:8 | All versions | 3.67.0-6.el8_4 | | `nss` | Red Hat:enterprise_linux:7::client | All versions | 0:3.53.1-7.el7_9 | | `nss-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 0:3.53.1-7.el7_9 | | `nss-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:3.53.1-7.el7_9 | | `nss-pkcs11-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:3.53.1-7.el7_9 | | `nss-sysinit` | Red Hat:enterprise_linux:7::client | All versions | 0:3.53.1-7.el7_9 | | `nss-tools` | Red Hat:enterprise_linux:7::client | All versions | 0:3.53.1-7.el7_9 | | `nss-debuginfo` | Red Hat:enterprise_linux:7::computenode | All versions | 0:3.53.1-7.el7_9 | | `nss-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:3.53.1-7.el7_9 | | `nss-pkcs11-devel` | Red Hat:enterprise_linux:7::computenode | All versions | 0:3.53.1-7.el7_9 | | `nss` | Red Hat:enterprise_linux:7::server | All versions | 0:3.53.1-7.el7_9 | | `nss-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:3.53.1-7.el7_9 | | `nss-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:3.53.1-7.el7_9 | | `nss-pkcs11-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:3.53.1-7.el7_9 | | `nss-sysinit` | Red Hat:enterprise_linux:7::server | All versions | 0:3.53.1-7.el7_9 | | `nss-tools` | Red Hat:enterprise_linux:7::server | All versions | 0:3.53.1-7.el7_9 | | `nss` | Red Hat:enterprise_linux:7::workstation | All versions | 0:3.53.1-7.el7_9 | | `nss-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 0:3.53.1-7.el7_9 | | `nss-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:3.53.1-7.el7_9 | | `nss-pkcs11-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:3.53.1-7.el7_9 | | `nss-sysinit` | Red Hat:enterprise_linux:7::workstation | All versions | 0:3.53.1-7.el7_9 | | `nss-tools` | Red Hat:enterprise_linux:7::workstation | All versions | 0:3.53.1-7.el7_9 | | `nspr` | Red Hat:enterprise_linux:8::appstream | All versions | 0:4.32.0-1.el8_4 | | `nspr-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:4.32.0-1.el8_4 | | `nspr-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 0:4.32.0-1.el8_4 | | `nspr-devel` | Red Hat:enterprise_linux:8::appstream | All versions | 0:4.32.0-1.el8_4 | | `nss` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.67.0-6.el8_4 | | `nss-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.67.0-6.el8_4 | | `nss-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 0:3.67.0-6.el8_4 | Products: Fedoraproject Fedora, Mozilla Network Security Services, Oracle Communications Offline Mediation Controller, Oracle Communications Pricing Design Center, Oracle Jd Edwards Enterpriseone Tools, Redhat Enterprise Linux. ## How do I fix CVE-2020-25648? Upgrade to a fixed version. ## Is CVE-2020-25648 being exploited? There is no known exploitation of CVE-2020-25648 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-2020-25648 and fix it if it is affected. What it is: CVE-2020-25648 is a high-severity vulnerability in Fedoraproject Fedora, published on 20 Oct 2020. Exploitation: There is no known exploitation of CVE-2020-25648 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-2020-25648/ (Markdown: https://insights.sbomify.com/CVE-2020-25648/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-25648 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-25648 - OSV: https://osv.dev/vulnerability/CVE-2020-25648 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-25648/ Summaries are generated and may contain mistakes; the official description above is the record.