CVE-2021-22727CWE-331

A CWE-331: Insufficient Entropy vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 /…

published July 21, 2021

CVSS
—
EPSS
1%
Percentile
72.3
In the wild
Unconfirmed
What it is

⚠️ A small entropy problem could unlock the gates to EVlink charging stations! If you’re using versions before R8 V3.4.0.1, it’s time to pay attention. 🔌 Think of this vulnerability like a safe with a predictable combination; if the code is simple enough, anyone can guess it and access the valuable contents inside— in this case, the charging station's web server. An attacker could exploit this flaw to gain unauthorized access to the server, potentially manipulating charging sessions or accessing sensitive data. While it’s not classified as critical or known to be exploited, this could put users’ data and the charging infrastructure at risk.

Put simply

Think of this vulnerability like a safe with a predictable combination; if the code is simple enough, anyone can guess it and access the valuable contents inside— in this case, the charging station's web server. The insufficient entropy vulnerability in EVlink devices allows attackers to predict and generate valid session identifiers, enabling unauthorized access to the charging station's web server.

What to do

An attacker could exploit this flaw to gain unauthorized access to the server, potentially manipulating charging sessions or accessing sensitive data. While it’s not classified as critical or known to be exploited, this could put users’ data and the charging infrastructure at risk. Upgrade your EVlink City, Parking, or Smart Wallbox devices to version R8 V3.4.0.1 or later immediately to close this vulnerability. Regularly monitor your systems and maintain good security practices to prevent unauthorized access. You’ve got this! Keep your charging stations secure and your community powered up! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01404 · 72.3th percentile
Weakness
CWE-331 · Insufficient Entropy
Published
2021-07-21T10:43Z
EPSS history
Timeline
  • 21 JUL 10:43Z
    A CWE-331: Insufficient Entropy vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 /…
    cvelistv5