CVE-2021-25935

Name: CVE-2021-25935
Creator: NVD / NIST
Published: 2021-05-25T19:15:07.657+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2021-25935 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. In OpenNMS Horizon, versions opennms-17.0.0-1 through opennms-27.1.0-1; OpenNMS Meridian, versions meridian-foundation-2015.1.0-1 through meridian-foundation-2019.1.18-1; meridian-foundation-2020.1.0-1 through meridian-foundation-2020.1.7-1 are vulnerable to Stored Cross-Site Scripting, since the function `add()` performs improper validation checks on the input sent to the `foreign-source` parameter. Due to this flaw an attacker could bypass the existing regex validation and inject an arbitrary script which will be stored in the database.. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

Description

In OpenNMS Horizon, versions opennms-17.0.0-1 through opennms-27.1.0-1; OpenNMS Meridian, versions meridian-foundation-2015.1.0-1 through meridian-foundation-2019.1.18-1; meridian-foundation-2020.1.0-1 through meridian-foundation-2020.1.7-1 are vulnerable to Stored Cross-Site Scripting, since the function `add()` performs improper validation checks on the input sent to the `foreign-source` parameter. Due to this flaw an attacker could bypass the existing regex validation and inject an arbitrary script which will be stored in the database.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.91%

55.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Opennms	Horizon	>= 17.0.0, <= 27.1.0
Opennms	Meridian	>= 2015.1.0, <= 2019.1.18
Opennms	Meridian	>= 2020.1.0, <= 2020.1.7

References

https://github.com/OpenNMS/opennms/commit/101e3aa06ec9a1f8f266335fc6f5685c062c6117Patch, Third Party Advisory
https://github.com/OpenNMS/opennms/commit/eb08b5ed4c5548f3e941a1f0d0363ae4439fa98cPatch, Third Party Advisory
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25935Exploit, Third Party Advisory
https://github.com/OpenNMS/opennms/commit/101e3aa06ec9a1f8f266335fc6f5685c062c6117Patch, Third Party Advisory
https://github.com/OpenNMS/opennms/commit/eb08b5ed4c5548f3e941a1f0d0363ae4439fa98cPatch, Third Party Advisory
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25935Exploit, Third Party Advisory

Timeline

Published: May 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25935?

How severe is CVE-2021-25935?

CVE-2021-25935 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25935?

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-2021-25935?

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

Scan your code now

Source: NVD / NIST