CVE-2021-27531

Name: CVE-2021-27531
Creator: NVD / NIST
Published: 2021-03-23T14:15:13.79+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.83%

Last modified Jun 17, 2026

CVE-2021-27531 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. A cross-site scripting (XSS) vulnerability in DynPG version 4.9.2 allows remote attackers to inject JavaScript via the "query" parameter.. EPSS estimates a 0.83% chance of exploitation in the next 30 days.

Description

A cross-site scripting (XSS) vulnerability in DynPG version 4.9.2 allows remote attackers to inject JavaScript via the "query" parameter.

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

0.83%

52.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Dynpg	Dynpg	4.9.2

References

https://github.com/xoffense/POC/blob/main/DynPG%204.9.2%20XSS%20via%20query%20parameterExploit, Third Party Advisory
https://github.com/xoffense/POC/blob/main/DynPG%204.9.2%20XSS%20via%20query%20parameterExploit, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-27531?

A cross-site scripting (XSS) vulnerability in DynPG version 4.9.2 allows remote attackers to inject JavaScript via the "query" parameter.

How severe is CVE-2021-27531?

CVE-2021-27531 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.83% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27531?

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-2021-27531?

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

Scan your code now

Source: NVD / NIST