CVE-2021-27786

Name: CVE-2021-27786
Creator: NVD / NIST
Published: 2022-06-09T17:15:08.56+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2021-27786 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Cross-origin resource sharing (CORS) enables browsers to perform cross domain requests in a controlled manner. This request has an Origin header that identifies the domain that is making the initial request and defines the protocol between a browser and server to see if the request is allowed. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

Cross-origin resource sharing (CORS) enables browsers to perform cross domain requests in a controlled manner. This request has an Origin header that identifies the domain that is making the initial request and defines the protocol between a browser and server to see if the request is allowed. An attacker can take advantage of this and possibly carry out privileged actions and access sensitive information when the Access-Control-Allow-Credentials is enabled.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.54%

41.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Hcltech	Onetest Server	10.0
Hcltech	Onetest Server	10.1
Hcltech	Onetest Server	10.2

References

https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098603Vendor Advisory
https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098603Vendor Advisory

Timeline

Published: Jun 9, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27786?

How severe is CVE-2021-27786?

CVE-2021-27786 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27786?

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-2021-27786?

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

Scan your code now

Source: NVD / NIST