CVE-2020-7451 Information disclosure in FreeBSD
A flaw in FreeBSD's IPv6 TCP implementation allows remote attackers to read one byte of kernel memory via crafted SYN-ACK or ACK segments.
- 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-2020-7451?
CVE-2020-7451 is a medium-severity vulnerability in Freebsd Freebsd, published on 28 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In FreeBSD 12.1-STABLE before r358739, 12.1-RELEASE before 12.1-RELEASE-p3, 11.3-STABLE before r358740, and 11.3-RELEASE before 11.3-RELEASE-p7, a TCP SYN-ACK or challenge TCP-ACK segment over IPv6 that is transmitted or retransmitted does not properly initialize the Traffic Class field disclosing one byte of kernel memory over the network.
Weakness: CWE-908
Which versions are affected by CVE-2020-7451?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2020-7451?
No fix has been published for CVE-2020-7451 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-7451 being exploited?
There is no known exploitation of CVE-2020-7451 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-vv76-2436-qvh9.