CVE-2021-35254Network attack vector

Authenticated remote code execution

Published Mar 25, 2022 · Updated Aug 4, 2024

Improper input validation in SolarWinds Web Help Desk 12.7.8 and earlier allows remote authenticated users to execute code. An undisclosed input accepts unsanitized data, and the application processes it in a way that reaches code execution; SolarWinds has not identified the field or handler. A valid application account and network access to the web interface are required before attacker-controlled code reaches the server process.

CVSS severity8.2
High
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in SolarWinds Web Help Desk 12.7.8 and earlier allows remote authenticated users to execute code. An undisclosed input accepts unsanitized data, and the application processes it in a way that reaches code execution; SolarWinds has not identified the field or handler. A valid application account and network access to the web interface are required before attacker-controlled code reaches the server process.

The record

CVE
CVE-2021-35254
Published
Mar 25, 2022
Updated
Aug 4, 2024
Vendor
SolarWinds
Product
Web Help Desk
Classifications
CWE-20, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=12.7.8 and previous versions <12.7.8 HF 1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SolarWinds · Web Help Deskversion=12.7.8 and previous versions <12.7.8 HF 1

Published CVSS scores

8.2SolarWindsCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1190Exploit Public-Facing Application

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

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Your stack

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