CVE-2021-35237Network attack vector

User-action hijacking via missing X-Frame-Options header

Published Oct 29, 2021 · Updated Sep 16, 2024

Clickjacking in SolarWinds Kiwi Syslog Server 9.7.2 and earlier allows remote attackers to hijack user actions through framed pages. Kiwi Web Access omits the X-Frame-Options response header, allowing an attacker-controlled transparent iframe to overlay its interface. Exploitation requires a user to visit an attacker-controlled page and click the concealed interface; resulting actions depend on the exposed controls.

CVSS severity5.0
Medium
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Clickjacking in SolarWinds Kiwi Syslog Server 9.7.2 and earlier allows remote attackers to hijack user actions through framed pages. Kiwi Web Access omits the X-Frame-Options response header, allowing an attacker-controlled transparent iframe to overlay its interface. Exploitation requires a user to visit an attacker-controlled page and click the concealed interface; resulting actions depend on the exposed controls.

The record

CVE
CVE-2021-35237
Published
Oct 29, 2021
Updated
Sep 16, 2024
Vendor
SolarWinds
Product
Kiwi Syslog Server
Classifications
CWE-1021, CAPEC-103
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.7.2 and previous versions <9.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SolarWinds · Kiwi Syslog Serverversion=9.7.2 and previous versions <9.7.2

Published CVSS scores

5.0SolarWindsCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1021Improper Restriction of Rendered UI Layers or Frames
CAPEC-103Clickjacking

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo