CVE-2021-39290

Name: CVE-2021-39290
Creator: NVD / NIST
Published: 2021-08-23T05:15:08.43+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.53%

Last modified Jun 17, 2026

CVE-2021-39290 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Certain NetModule devices allow Limited Session Fixation via PHPSESSID. These models with firmware before 4.3.0.113, 4.4.0.111, and 4.5.0.105 are affected: NB800, NB1600, NB1601, NB1800, NB1810, NB2700, NB2710, NB2800, NB2810, NB3700, NB3701, NB3710, NB3711, NB3720, and NB3800.. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

Description

Certain NetModule devices allow Limited Session Fixation via PHPSESSID. These models with firmware before 4.3.0.113, 4.4.0.111, and 4.5.0.105 are affected: NB800, NB1600, NB1601, NB1800, NB1810, NB2700, NB2710, NB2800, NB2810, NB3700, NB3701, NB3710, NB3711, NB3720, and NB3800.

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

1.53%

71.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-384

Affected Software

Vendor	Product	Versions
Netmodule	Netmodule Router Software	< 4.3.0.113
Netmodule	Netmodule Router Software	>= 4.4.0.0, < 4.4.0.111
Netmodule	Netmodule Router Software	>= 4.5.0.0, < 4.5.0.105

References

https://seclists.org/fulldisclosure/2021/Aug/22Exploit, Mailing List, Third Party Advisory
https://www.netmodule.comVendor Advisory
https://seclists.org/fulldisclosure/2021/Aug/22Exploit, Mailing List, Third Party Advisory
https://www.netmodule.comVendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-39290?

How severe is CVE-2021-39290?

CVE-2021-39290 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39290?

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-2021-39290?

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

Scan your code now

Source: NVD / NIST