CVE-2021-35478
Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history and audit log function.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 76.6%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.
Description
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.
- CVSS 3.1
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 76.62% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- nagios/log server
- Source
- cve@mitre.org
EPSS 76.6% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://research.nccgroup.com/2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2021-35479/Exploit, Third Party Advisory
- https://research.nccgroup.com/?research=Technical%20advisoriesThird Party Advisory
- https://www.nagios.com/downloads/nagios-log-server/change-log/Release Notes, Vendor Advisory
- https://research.nccgroup.com/2021/07/22/technical-advisory-stored-and-reflected-xss-vulnerability-in-nagios-log-server-cve-2021-35478cve-2021-35479/Exploit, Third Party Advisory
- https://research.nccgroup.com/?research=Technical%20advisoriesThird Party Advisory
- https://www.nagios.com/downloads/nagios-log-server/change-log/Release Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.