CVE-2021-39290

Certain NetModule devices allow Limited Session Fixation via PHPSESSID

published August 23, 2021

CVSS
—
EPSS
2%
Percentile
74.5
In the wild
Unconfirmed
What it is

⚠️ Limited session fixation in NetModule devices could leave you exposed, especially if you're running firmware versions before 4.3.0.113! 🚨 Think of it like a hotel that never resets your room key after check-in — someone could easily swipe your keycard and waltz right into your room without you knowing! If an attacker exploits this vulnerability, they could impersonate a legitimate user within the session, gaining unauthorized access to sensitive data and features. This could lead to unauthorized actions being taken on the device, potentially compromising its integrity.

Put simply

Think of it like a hotel that never resets your room key after check-in — someone could easily swipe your keycard and waltz right into your room without you knowing! This vulnerability allows an attacker to exploit session tokens (PHPSESSID) on affected NetModule devices, which can be manipulated if proper session management controls are not implemented. This flaw opens the door for session fixation attacks where an attacker can hijack a user session.

What to do

If an attacker exploits this vulnerability, they could impersonate a legitimate user within the session, gaining unauthorized access to sensitive data and features. This could lead to unauthorized actions being taken on the device, potentially compromising its integrity. To protect your device, update the firmware to at least versions 4.3.0.113, 4.4.0.111, or 4.5.0.105 immediately. Ensure that session management practices are in place to regenerate session identifiers post-authentication. Regular audits of your firmware can help avoid future vulnerabilities. You've got this! Keep your devices updated and secure, and you’ll be a security hero in no time! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01529 · 74.5th percentile
Published
2021-08-23T04:35Z
EPSS history
Timeline
  • 23 AUG 04:35Z
    Certain NetModule devices allow Limited Session Fixation via PHPSESSID
    cvelistv5