CVE Record
[ HIGH ]CVE-2021-25297
Nagios XI OS Command Injection
Nagios XI contains a vulnerability which can lead to OS command injection on the Nagios XI server.
- Vendor
- Nagios
- Product
- Nagios XI
- CVSS
- 8.8
- EPSS (exploit probability)
- 56.7%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2021-25297 being exploited?
Yes. CISA added CVE-2021-25297 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 56.7% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (14 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Nagios XI CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2021-25298 Nagios XI OS Command Injection | [ HIGH ] | 8.8 | 73.6% | |
| CVE-2021-25296 Nagios XI OS Command Injection | [ HIGH ] | 8.8 | 71.9% | |
| CVE-2019-15949 Nagios XI Remote Code Execution Vulnerability | [ HIGH ] | 8.8 | 77.0% |