CVE-2021-35478 json
Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history and audit log function.
published 2021-07-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-22120
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 76.6%
- EPSS 76.6% chance of exploitation in 30 days, percentile 99.5%
- public exploits
- 0
- none known
Summary
Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history and audit log function. All parameters used for filtering are affected. This affects users who open a crafted link or third-party web page.
Patch / fix
- nagios log_server 2.1.9
Exploit prediction
76.62% chance of exploitation in the next 30 days, higher than 99.5% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- research.nccgroup.com https://research.nccgroup.com/2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2021-35479/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
research.nccgroup.com
/2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2
exploit, third-party-advisory
-
nagios.com
/downloads/nagios-log-server/change-log/
release-notes, vendor-advisory
-
research.nccgroup.com
/?research=Technical%20advisories
third-party-advisory
Sources
- CVE List CVE-2021-35478
- NVD CVE-2021-35478
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.