CVE-2021-33304 Use after free in n/a

Critical 9.8 Published 15 Feb 2023 Updated 20 Mar 2025

Attackers can execute arbitrary code via a double free vulnerability in the picoTCP networking library's fragment reassembly module.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-33304?

CVE-2021-33304 is a critical use after free vulnerability in n/a, published on 15 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Double Free vulnerability in virtualsquare picoTCP v1.7.0 and picoTCP-NG v2.1 in modules/pico_fragments.c in function pico_fragments_reassemble, allows attackers to execute arbitrary code.

Weakness: CWE-415

Which versions are affected by CVE-2021-33304?

It affects 2 products.

Products include Altran Picotcp, Altran Picotcp-Ng.

How do I fix CVE-2021-33304?

No fix has been published for CVE-2021-33304 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2021-33304 being exploited?

There is no known exploitation of CVE-2021-33304 in the wild and no public exploit code.

Sources

Also known as GHSA-rrwx-6mf8-vc3j.