Nagios vulnerabilities
- Nagios has 114 CVE records published between 28 Oct 2023 and 28 Oct 2026, ranking #117 of 420 vendors on this site by that count.
- Of the 114 with a CVSS score, 56 (49.1%) are rated critical or high; 0 (0% of all) have no CVSS score.
- 4 vulnerabilities attributed to Nagios are listed in CISA's Known Exploited Vulnerabilities (KEV) catalog; the most recent, CVE-2021-25296, was added on 18 Jan 2022.
- None of them is marked as known to be used in ransomware campaigns.
- For the 4 KEV entries with a published CVE record, the median time from CVE publication to KEV listing is 337 days.
Records are attributed to Nagios from the vendor named in the source records. About the data.
CVE records per year
Show data as a table
| Year | CVE records |
|---|---|
| 2017 | 0 |
| 2018 | 7 |
| 2019 | 1 |
| 2020 | 0 |
| 2021 | 5 |
| 2022 | 1 |
| 2023 | 0 |
| 2024 | 5 |
| 2025 | 104 |
| 2026 | 5 |
2026 is partial (through 28 Oct 2026), shown in a lighter bar.
| Year | Records | Critical | High | Critical or high | Not scored |
|---|---|---|---|---|---|
| 2026 | 5 | 0 | 3 | 60% | 0% |
| 2025 | 104 | 14 | 34 | 46.2% | 0% |
| 2024 | 5 | 3 | 2 | 100% | 0% |
| 2023 | 0 | 0 | 0 | — | — |
| 2022 | 1 | 0 | 0 | 0% | 0% |
| 2021 | 5 | 0 | 3 | 100% | 40% |
| 2020 | 0 | 0 | 0 | — | — |
| 2019 | 1 | 0 | 1 | 100% | 0% |
| 2018 | 7 | 0 | 0 | — | 100% |
| 2017 | 0 | 0 | 0 | — | — |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Exploited vulnerabilities in CISA's KEV catalog
| CVE | Product | Name | Added | Ransomware |
|---|---|---|---|---|
| CVE-2021-25296 | Nagios XI | Nagios XI OS Command Injection | 2022-01-18 | Unknown |
| CVE-2021-25297 | Nagios XI | Nagios XI OS Command Injection | 2022-01-18 | Unknown |
| CVE-2021-25298 | Nagios XI | Nagios XI OS Command Injection | 2022-01-18 | Unknown |
| CVE-2019-15949 | Nagios XI | Nagios XI Remote Code Execution Vulnerability | 2021-11-03 | Unknown |
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.27, as of 27 Oct 2026. About the data.
Highest exploit-prediction scores (EPSS)
EPSS estimates the probability that a vulnerability is exploited in the next 30 days. These are the 10 highest-scoring Nagios records today.
| CVE | EPSS | Percentile | Severity | In KEV |
|---|---|---|---|---|
| CVE-2018-15708 | 89.4% | 99.8% | Not scored | No |
| CVE-2019-15949 | 77% | 99.5% | High | Yes |
| CVE-2026-2041 | 75.6% | 99.5% | High | No |
| CVE-2026-2043 | 75.4% | 99.5% | High | No |
| CVE-2021-25298 | 73.6% | 99.5% | High | Yes |
| CVE-2021-25296 | 71.9% | 99.4% | High | Yes |
| CVE-2021-25297 | 56.7% | 99.1% | High | Yes |
| CVE-2018-15712 | 48.6% | 98.9% | Not scored | No |
| CVE-2024-24401 | 45.9% | 98.8% | Critical | No |
| CVE-2018-15710 | 38.2% | 98.6% | Not scored | No |
Source: FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.27, as of 27 Oct 2026. About the data.