CVE-2021-35243

Name: CVE-2021-35243
Creator: NVD / NIST
Published: 2021-12-23T20:15:11.48+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.90%

Last modified Jun 17, 2026

CVE-2021-35243 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.90% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.90%

55.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-749

Affected Software

Vendor	Product	Versions
Solarwinds	Web Help Desk	<= 12.7.7

References

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

Timeline

Published: Dec 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35243?

How severe is CVE-2021-35243?

CVE-2021-35243 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35243?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35243?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST