Clickjacking Vulnerability

published 2021-10-29 5y ago modified 2026-06-17 4mo ago also EUVD-2021-21880

cvss: 5.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits: 0; none known

A missing HTTP header (X-Frame-Options) in Kiwi Syslog Server has left customers vulnerable to click jacking. Clickjacking is an attack that occurs when an attacker uses a transparent iframe in a window to trick a user into clicking on an actionable item, such as a button or link, to another server in which they have an identical webpage. The attacker essentially hijacks the user activity intended for the original server and sends them to the other server. This is an attack on both the user and the server.

Patch / fix

fixed in 1

SolarWinds Kiwi Syslog Server 9.7.2

Is CVE-2021-35237 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.0	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

SolarWinds Kiwi Syslog Server

Classification

Weakness

CWE-1021 Improper Restriction of Rendered UI Layers or Frames

References

documentation.solarwinds.com /en/success_center/kss/content/release_notes/kss_9-8_release_notes.htm
release-notes, vendor-advisory
solarwinds.com /trust-center/security-advisories/cve-2021-35237
vendor-advisory

Sources

CVE List CVE-2021-35237
NVD CVE-2021-35237

Fencer Intel 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.