The vulnerability was used in the wild against PyBitmessage v0.6.2 users. According to vendor's notice, Bitmessage developer Peter ┼аurda's Bitmessage addresses were compromised as well by the attackers.
Vulnerable component: PyBitmessage
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-20 - Improper Input Validation
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists due to a message encoding bug. A remote attacker can send a specially crafted message, run an automated script looking in ~/.electrum/wallets, open a remote reverse shell, gain access to other files and execute arbitrary code.
Successful exploitation of the vulnerability results in system compromise.
Note: the vulnerability has been actively exploited to create a remote shell and steal bitcoins from Electrum wallets.