CVE-2021-39243

Name: CVE-2021-39243
Creator: NVD / NIST
Published: 2021-08-23T05:15:08.237+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2021-39243 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Cross-Site Request Forgery (CSRF) exists on Altus Nexto, Nexto Xpress, and Hadron Xtorm devices via any CGI endpoint. This affects Nexto NX3003 1.8.11.0, Nexto NX3004 1.8.11.0, Nexto NX3005 1.8.11.0, Nexto NX3010 1.8.3.0, Nexto NX3020 1.8.3.0, Nexto NX3030 1.8.3.0, Nexto NX5100 1.8.11.0, Nexto NX5101 1.8.11.0, Nexto NX5110 1.1.2.8, Nexto NX5210 1.1.2.8, Nexto Xpress XP300 1.8.11.0, Nexto Xpress XP315 1.8.11.0, Nexto Xpress XP325 1.8.11.0, Nexto Xpress XP340 1.8.11.0, and Hadron Xtorm HX3040 1.7.58.0.. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

Description

Cross-Site Request Forgery (CSRF) exists on Altus Nexto, Nexto Xpress, and Hadron Xtorm devices via any CGI endpoint. This affects Nexto NX3003 1.8.11.0, Nexto NX3004 1.8.11.0, Nexto NX3005 1.8.11.0, Nexto NX3010 1.8.3.0, Nexto NX3020 1.8.3.0, Nexto NX3030 1.8.3.0, Nexto NX5100 1.8.11.0, Nexto NX5101 1.8.11.0, Nexto NX5110 1.1.2.8, Nexto NX5210 1.1.2.8, Nexto Xpress XP300 1.8.11.0, Nexto Xpress XP315 1.8.11.0, Nexto Xpress XP325 1.8.11.0, Nexto Xpress XP340 1.8.11.0, and Hadron Xtorm HX3040 1.7.58.0.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.53%

41.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Altus	Nexto Nx3003 Firmware	1.8.11.0
Altus	Nexto Nx3004 Firmware	1.8.11.0
Altus	Nexto Nx3005 Firmware	1.8.11.0
Altus	Nexto Nx3010 Firmware	1.8.3.0
Altus	Nexto Nx3020 Firmware	1.8.3.0
Altus	Nexto Nx3030 Firmware	1.8.3.0
Altus	Nexto Nx5100 Firmware	1.8.11.0
Altus	Nexto Nx5101 Firmware	1.8.11.0
Altus	Nexto Nx5110 Firmware	1.1.2.8
Altus	Nexto Nx5210 Firmware	1.1.2.8
Altus	Nexto Xpress Xp300 Firmware	1.8.11.0
Altus	Nexto Xpress Xp315 Firmware	1.8.11.0
Altus	Nexto Xpress Xp325 Firmware	1.8.11.0
Altus	Nexto Xpress Xp340 Firmware	1.8.11.0
Altus	Hadron Xtorm Hx3040 Firmware	1.7.58.0

References

http://seclists.org/fulldisclosure/2021/Aug/21Exploit, Mailing List, Third Party Advisory
https://www.altus.com.br/Vendor Advisory
http://seclists.org/fulldisclosure/2021/Aug/21Exploit, Mailing List, Third Party Advisory
https://www.altus.com.br/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-39243?

How severe is CVE-2021-39243?

CVE-2021-39243 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39243?

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-2021-39243?

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

Scan your code now

Source: NVD / NIST