CVE-2020-27636

In Microchip MPLAB Net 3.6.1, TCP ISNs are improperly random

published October 10, 2023

CVSS
—
EPSS
1%
Percentile
58.4
In the wild
Unconfirmed
What it is

⚠️ Calling all developers! A sneaky issue in Microchip MPLAB Net 3.6.1 could let your TCP connections be more predictable than a toddler's tantrum! 😅 Think of TCP Initial Sequence Numbers (ISNs) like lottery ticket numbers. If the numbers are chosen randomly, it's exciting and unique. But if they're picked methodically, then someone could guess your ticket and crash the party! While this vulnerability isn’t known to be exploited yet, improper randomness could potentially allow attackers to predict TCP connections, leading to man-in-the-middle attacks or session hijacking. In a world where data integrity is paramount, this predictability could pave the way for unauthorized access to sensitive information.

Put simply

Think of TCP Initial Sequence Numbers (ISNs) like lottery ticket numbers. If the numbers are chosen randomly, it's exciting and unique. But if they're picked methodically, then someone could guess your ticket and crash the party! The vulnerability arises from the fact that TCP ISNs are generated in a less-than-random manner, making it easier for an attacker to guess them. This flaw could undermine the security of ongoing TCP sessions, especially in network communications.

What to do

While this vulnerability isn’t known to be exploited yet, improper randomness could potentially allow attackers to predict TCP connections, leading to man-in-the-middle attacks or session hijacking. In a world where data integrity is paramount, this predictability could pave the way for unauthorized access to sensitive information. To mitigate this risk, ensure your Microchip MPLAB Net is updated to a safer version if available. Alternatively, consider implementing additional layers of security, such as encryption for your TCP connections, to protect against potential attacks. Regularly audit your configurations to maintain a robust security posture. You've got this! With a few updates and some good practices, you can keep your connections secure and your users safe! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00871 · 58.4th percentile
Published
2023-10-10T00:00Z
EPSS history
Timeline
  • 10 OCT 00:00Z
    In Microchip MPLAB Net 3.6.1, TCP ISNs are improperly random
    cvelistv5