CVE-2021-35478
Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-35478- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-35478- Updated
- 2026-11-02
EUVDEUVD-2021-22120 No score
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.
- Record
EUVD-2021-22120- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9q74-9jcx-243m No score
Nagios Log Server before 2.1.9 contains Reflected XSS in the dropdown box for the alert history...
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.
- Record
GHSA-9q74-9jcx-243m- Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-35478 is a medium vulnerability (CVSS 5.4) in Nagios Log Server, published July 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 76.6%, the 99th percentile. No source names a fixed version.
References
nagios.com/downloads/nagios-log-server/change-log
research.nccgroup.com?research=Technical%20advisories
nvd.nist.gov/vuln/detail/CVE-2021-35478
github.com/advisories/GHSA-9q74-9jcx-243m