What is CVE-2021-35489?

CVE-2021-35489 is a medium-severity vulnerability in Thruk, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-11-09.

How severe is CVE-2021-35489?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-35489 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Thruk

CVE-2021-35489

Thruk 2.40-2 allows /thruk/#cgi-bin/extinfo.cgi?type=2&host={HOSTNAME]&service={SERVICENAME]&backend={BACKEND] Reflected XSS via the host or service parameter. An attacker could inject arbitrary JavaScript into extinfo.cgi. The malicious payload would be triggered every time an authenticated user browses the page containing it.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.009 (56.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Thruk — versions 2.40-2
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_MISC, Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-35489?: CVE-2021-35489 is a medium-severity vulnerability in Thruk, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-11-09.
How severe is CVE-2021-35489?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-35489 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.