# CVE-2024-13176: Timing side-channel in ECDSA signature computation > A timing side-channel in OpenSSL ECDSA signature computation allows local attackers to potentially recover private keys. - **Severity:** Medium 4.1 (`CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 20 Jan 2025 - **Updated:** 18 Mar 2026 - **Also known as:** ALPINE-CVE-2024-13176, AZL-55889, AZL-55894, AZL-56010, AZL-78537, BELL-CVE-2024-13176, CLSA-2025-1751142817, CLSA-2025-1751888871, CLSA-2025-1751889283, CLSA-2025-1759865335, CLSA-2026-1785400004, DEBIAN-CVE-2024-13176, DLA-4176-1, ECHO-e857-6d70-7368, GHSA-r9fv-h47r-823f, JLSEC-2026-248, MGASA-2025-0025, MGASA-2025-0101, MINI-697q-w5vg-r6cr, OESA-2025-1287, SUSE-SU-2025:0345-1, SUSE-SU-2025:0349-1, SUSE-SU-2025:0356-1, SUSE-SU-2025:0387-1, SUSE-SU-2025:0388-1, SUSE-SU-2025:0390-1, SUSE-SU-2025:0430-1, SUSE-SU-2025:0613-1, SUSE-SU-2025:0613-2, SUSE-SU-2025:0613-3, SUSE-SU-2025:20233-1, SUSE-SU-2025:20464-1, UBUNTU-CVE-2024-13176, openSUSE-SU-2025:14696-1 ## What is CVE-2024-13176? CVE-2024-13176 is a medium-severity vulnerability in OpenSSL, published on 20 Jan 2025. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description Issue summary: A timing side-channel which could potentially allow recovering the private key exists in the ECDSA signature computation. Impact summary: A timing side-channel in ECDSA signature computations could allow recovering the private key by an attacker. However, measuring the timing would require either local access to the signing application or a very fast network connection with low latency. There is a timing signal of around 300 nanoseconds when the top word of the inverted ECDSA nonce value is zero. This can happen with significant probability only for some of the supported elliptic curves. In particular the NIST P-521 curve is affected. To be able to measure this leak, the attacker process must either be located in the same physical computer or must have a very fast network connection with low latency. For that reason the severity of this vulnerability is Low. The FIPS modules in 3.4, 3.3, 3.2, 3.1 and 3.0 are affected by this issue. Weakness: CWE-385 (Covert Timing Channel) ## Which versions are affected by CVE-2024-13176? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `openssl-1_1` | SUSE:Enterprise Storage 7.1 | All versions | 1.1.1d-150200.11.100.1 | | `openssl-1_1` | SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | All versions | 1.1.1d-150200.11.100.1 | | `openssl-1_1` | SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 1.1.1l-150400.7.78.1 | | `openssl-3` | SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 3.0.8-150400.4.72.1 | | `openssl-1_1` | SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 1.1.1l-150400.7.78.1 | | `openssl-3` | SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 3.0.8-150400.4.72.1 | | `openssl-1_1` | SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 1.1.1l-150500.17.40.1 | | `openssl-3` | SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 3.0.8-150500.5.51.1 | | `openssl-1_1` | SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 1.1.1l-150500.17.40.1 | | `openssl-3` | SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 3.0.8-150500.5.51.1 | | `openssl-1_1` | SUSE:Linux Enterprise Micro 5.1 | All versions | 1.1.1d-150200.11.100.1 | | `openssl-1_1` | SUSE:Linux Enterprise Micro 5.2 | All versions | 1.1.1d-150200.11.100.1 | | `openssl-1_1` | SUSE:Linux Enterprise Micro 5.3 | All versions | 1.1.1l-150400.7.78.1 | | `openssl-3` | SUSE:Linux Enterprise Micro 5.3 | All versions | 3.0.8-150400.4.72.1 | | `openssl-1_1` | SUSE:Linux Enterprise Micro 5.4 | All versions | 1.1.1l-150400.7.78.1 | | `openssl-3` | SUSE:Linux Enterprise Micro 5.4 | All versions | 3.0.8-150400.4.72.1 | | `openssl-1_1` | SUSE:Linux Enterprise Micro 5.5 | All versions | 1.1.1l-150500.17.40.1 | | `openssl-1_1` | SUSE:Linux Enterprise Module for Basesystem 15 SP6 | All versions | 1.1.1w-150600.5.12.2 | | `openssl-3` | SUSE:Linux Enterprise Module for Basesystem 15 SP6 | All versions | 3.1.4-150600.5.24.1 | | `openssl-1_1` | SUSE:Linux Enterprise Module for Certifications 15 SP7 | All versions | 1.1.1w-150600.5.12.2 | | `openssl-1_1` | SUSE:Linux Enterprise Module for Certifications 15 SP7 | All versions | 1.1.1w-150600.5.12.2 | | `openssl-1_1` | SUSE:Linux Enterprise Module for Development Tools 15 SP6 | All versions | 1.1.1w-150600.5.12.2 | | `openssl-1_1` | SUSE:Linux Enterprise Module for Legacy 15 SP6 | All versions | 1.1.1w-150600.5.12.2 | | `openssl-1_1` | SUSE:Linux Enterprise Server 12 SP5-LTSS | All versions | 1.1.1d-2.116.1 | | `openssl-1_1` | SUSE:Linux Enterprise Server 15 SP3-LTSS | All versions | 1.1.1d-150200.11.100.1 | | `openssl-1_1` | SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 1.1.1l-150400.7.78.1 | | `openssl-3` | SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 3.0.8-150400.4.72.1 | | `openssl-1_1` | SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 1.1.1l-150500.17.40.1 | | `openssl-3` | SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 3.0.8-150500.5.51.1 | | `openssl-1_1` | SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 1.1.1d-2.116.1 | | `openssl-1_1` | SUSE:Linux Enterprise Server for SAP Applications 15 SP3 | All versions | 1.1.1d-150200.11.100.1 | | `openssl-1_1` | SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 1.1.1l-150400.7.78.1 | | `openssl-3` | SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 3.0.8-150400.4.72.1 | | `openssl-1_1` | SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 1.1.1l-150500.17.40.1 | | `openssl-3` | SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 3.0.8-150500.5.51.1 | | `openssl-3` | SUSE:Linux Micro 6.0 | All versions | 3.1.4-9.1 | | `openssl-3` | SUSE:Linux Micro 6.1 | All versions | 3.1.4-slfo.1.1_4.1 | | `openssl-1_1` | SUSE:Manager Proxy 4.3 | All versions | 1.1.1l-150400.7.78.1 | | `openssl-3` | SUSE:Manager Proxy 4.3 | All versions | 3.0.8-150400.4.72.1 | | `openssl-1_1` | SUSE:Manager Server 4.3 | All versions | 1.1.1l-150400.7.78.1 | ## How do I fix CVE-2024-13176? Apply the vendor's patch. ## Is CVE-2024-13176 being exploited? There is no known exploitation of CVE-2024-13176 in the wild and no public exploit code. Public exploit code: - Instrumented analysis and reproducibility materials for ECDSA timing leakage in OpenSSL CVE-2024-13176 (github_poc): https://github.com/Haomin-Yu/cve-2024-13176-timing-analysis ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2024-13176 and fix it if it is affected. What it is: CVE-2024-13176 is a medium-severity vulnerability in OpenSSL, published on 20 Jan 2025. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2024-13176 in the wild and no public exploit code. Affected product: OpenSSL. 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-2024-13176/ (Markdown: https://insights.sbomify.com/CVE-2024-13176/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2024-13176 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-13176 - OSV: https://osv.dev/vulnerability/CVE-2024-13176 --- From sbomify Insights: https://insights.sbomify.com/CVE-2024-13176/ Summaries are generated and may contain mistakes; the official description above is the record.