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Vulnerability record · CVE-2021-35243 · published 23 December 2021

CVE-2021-35243: Solarwinds web help desk vulnerability

Solarwinds · Web Help Desk

The HTTP PUT and DELETE methods were enabled in the Web Help Desk web server (12.7.7 and earlier), allowing users to execute dangerous HTTP requests. The HTTP PUT method is normally used to upload data that is saved on the server with a user-supplied URL. While the DELETE method requests that the origin server removes the association between the target resource and its current functionality. Improper use of these methods may lead to a loss of integrity.

7.5 CVSS 3.1 High EPSS 0.90% · top 41.9% CWE-749 · CWE-749
7.5CVSS 3.1 base score, v2 5.0
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

The HTTP PUT and DELETE methods were enabled in the Web Help Desk web server (12.7.7 and earlier), allowing users to execute dangerous HTTP requests. The HTTP PUT method is normally used to upload data that is saved on the server with a user-supplied URL. While the DELETE method requests that the origin server removes the association between the target resource and its current functionality. Improper use of these methods may lead to a loss of integrity.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.solarwinds.com/SuccessCenter/s/article/Web-Help-Desk-12-7-7-Hotfix-1-Release-Notes?language=en_US Release NotesVendor Advisory
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35243 Vendor Advisory
https://support.solarwinds.com/SuccessCenter/s/article/Web-Help-Desk-12-7-7-Hotfix-1-Release-Notes?language=en_US Release NotesVendor Advisory
https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35243 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-40551SolarWinds Web Help Desk unauthenticated deserialization RCESolarWinds Web Help Desk contains an untrusted data deserialization flaw (CWE-502) that can lead to remote code execution, allowing an attacker to ru…KEVEPSS 84%analysed9.8CVE-2025-40536SolarWinds Web Help Desk security control bypass allows unauthenticated accessSolarWinds Web Help Desk contains a security control bypass (CWE-693) that lets an unauthenticated attacker reach restricted functionality. It is rat…KEVEPSS 74%analysed9.8CVE-2025-26399SolarWinds Web Help Desk unauthenticated deserialization RCESolarWinds Web Help Desk contains an unauthenticated deserialization flaw in the AjaxProxy component that allows remote code execution on the host. I…KEVEPSS 90%analysed9.8CVE-2024-28986SolarWinds Web Help Desk Java deserialization remote code executionSolarWinds Web Help Desk contains a Java deserialization flaw (CWE-502) that allows remote code execution on the host. The vendor originally reported…KEVEPSS 85%analysed9.1CVE-2024-28987SolarWinds Web Help Desk hardcoded credential flawSolarWinds Web Help Desk contains a hardcoded credential vulnerability (CWE-798) that lets a remote, unauthenticated attacker reach internal function…KEVEPSS 93%analysed9.8CVE-2026-28323Solarwinds web help desk improper authentication vulnerabilitySolarWinds Web Help Desk is found to be affected by a SAML authentication bypass vulnerability. This requires the SAML 2.0 authentication method to b…EPSS 1.0%9.8CVE-2025-40552SolarWinds Web Help Desk authentication bypassSolarWinds Web Help Desk contains an authentication bypass (CWE-1390) that lets an unauthenticated actor invoke actions and methods that should requi…EPSS 52%analysed9.8CVE-2025-40553SolarWinds Web Help Desk unauthenticated deserialization RCESolarWinds Web Help Desk is affected by an untrusted data deserialization flaw (CWE-502) that can lead to remote code execution. The vulnerability is…EPSS 68%analysed

Source: NIST National Vulnerability Database (record CVE-2021-35243), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.