CVE-2020-27213 Weak cryptography in n/a
Insufficiently random TCP Initial Sequence Numbers in Ethernut Nut/OS allow attackers to hijack existing connections or spoof future ones.
- 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-2020-27213?
CVE-2020-27213 is a high-severity vulnerability in n/a, published on 10 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Ethernut Nut/OS 5.1. The code that generates Initial Sequence Numbers (ISNs) for TCP connections derives the ISN from an insufficiently random source. As a result, an attacker may be able to determine the ISN of current and future TCP connections and either hijack existing ones or spoof future ones. While the ISN generator seems to adhere to RFC 793 (where a global 32-bit counter is incremented roughly every 4 microseconds), proper ISN generation should aim to follow at least the specifications outlined in RFC 6528.
Weakness: CWE-330
Which versions are affected by CVE-2020-27213?
It affects 1 product.
Products include Ethernut Nut\/Os.
How do I fix CVE-2020-27213?
No fix has been published for CVE-2020-27213 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-27213 being exploited?
There is no known exploitation of CVE-2020-27213 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-5wm2-v84q-jw9v.