CVE-2020-25862 Denial of service in n/a
A flaw in the TCP dissector allows remote attackers to crash Wireshark by sending packets with an invalid checksum, requiring users to upgrade to a patched version.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-25862?
CVE-2020-25862 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 6 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Wireshark 3.2.0 to 3.2.6, 3.0.0 to 3.0.13, and 2.6.0 to 2.6.20, the TCP dissector could crash. This was addressed in epan/dissectors/packet-tcp.c by changing the handling of the invalid 0xFFFF checksum.
Weakness: CWE-354
Which versions are affected by CVE-2020-25862?
It affects 5 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap, Oracle Zfs Storage Appliance Firmware, Wireshark Wireshark.
How do I fix CVE-2020-25862?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-25862 being exploited?
There is no known exploitation of CVE-2020-25862 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2020-25862, GHSA-pjfh-cvv7-x572, UBUNTU-CVE-2020-25862.