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9.1

In PicoTCP 1.7.0, TCP ISNs are improperly random.

CVE-2020-27635 · published 3 years ago
Summary

In PicoTCP 1.7.0, TCP ISNs are improperly random.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
capgemini picotcp 1.7.0
cpe:2.3:a:capgemini:picotcp:1.7.0:*:*:*:*:*:*:*
Original advisory text
In PicoTCP 1.7.0, TCP ISNs are improperly random.
In PicoTCP 1.7.0, TCP ISNs are improperly random.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.1 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-330Use of Insufficiently Random Values
Timeline
Published10 Oct 2023
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2020-27635 · NVD
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