Apache Cassandra vulnerabilities: known CVEs & security history
Apache · Database · 16 tracked CVEs · 1 actively exploited · updated June 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Apache Cassandra release lines — 16 in total, with 1 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Apache Cassandra's current status and the safe version to run.
Known Apache Cassandra CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2016-3427⚡ exploited | critical | 9.8 | 92% | 2016 |
| CVE-2018-8016 | critical | 9.8 | 2% | 2018 |
| CVE-2021-44521 | critical | 9.1 | 55% | 2022 |
| CVE-2026-27314 | high | 8.8 | 0% | 2026 |
| CVE-2025-26467 | high | 8.8 | 0% | 2025 |
| CVE-2025-23015 | high | 8.8 | 1% | 2025 |
| CVE-2023-30601 | high | 7.8 | 0% | 2023 |
| CVE-2020-17516 | high | 7.5 | 2% | 2021 |
| CVE-2016-4970 | high | 7.5 | 11% | 2017 |
| CVE-2015-0225 | high | 7.5 | 7% | 2015 |
| CVE-2026-32588 | medium | 6.5 | 1% | 2026 |
| CVE-2020-13946 | medium | 5.9 | 3% | 2020 |
| CVE-2019-2684 | medium | 5.9 | 38% | 2019 |
| CVE-2026-27315 | medium | 5.5 | 0% | 2026 |
| CVE-2025-24860 | medium | 5.4 | 1% | 2025 |
| CVE-2024-27137 | medium | 5.3 | 0% | 2025 |
Is my Apache Cassandra version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Apache Cassandra version → · Monitor Apache Cassandra for new CVEs →
Apache Cassandra vulnerabilities — frequently asked
How many known vulnerabilities does Apache Cassandra have?
IsItPatched tracks 16 CVEs for Apache Cassandra, 1 of which is actively exploited (CISA KEV). 3 are critical-severity and 7 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Apache Cassandra have any actively-exploited vulnerabilities?
Yes — 1 Apache Cassandra CVE is in CISA's Known Exploited Vulnerabilities catalog, meaning it is confirmed exploited in the wild. Patch it as a priority.
What is the most severe Apache Cassandra vulnerability?
Among tracked issues, CVE-2016-3427 (CRITICAL, CVSS 9.8), which is actively exploited, ranks highest — a Improper access control weakness.
Is Apache Cassandra safe to use?
It depends on the version. The latest supported Apache Cassandra release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Apache Cassandra security status · Apache Cassandra end-of-life · actively-exploited CVEs. Always verify against Apache's advisories — see our disclaimer.