CVE-2020-25862

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-10-06 · updated 2026-06-17
Weakness: CWE-354

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.

Affected products

Debian Linux: 9.0
Fedoraproject Fedora: 31, 32, 33
openSUSE Leap: 15.1, 15.2
Oracle Zfs Storage Appliance Firmware: 8.8
Wireshark Foundation Wireshark: from 2.6.0 through 2.6.20; from 3.0.0 through 3.0.13; from 3.2.0 through 3.2.6

References

http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00038.html
https://gitlab.com/wireshark/wireshark/-/commit/7f3fe6164a68b76d9988c4253b24d43f498f1753
https://gitlab.com/wireshark/wireshark/-/issues/16816
https://lists.debian.org/debian-lts-announce/2021/02/msg00008.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DQHPKZFQ7W3X34RYN3FWFYCFJD4FXJW/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6IGRYKW4XLR44YDWTAH547ODYYBYPB2D/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZUHMK5HYTUUDXA64T2TAMAFMYV674QBW/
https://www.oracle.com/security-alerts/cpujan2021.html
https://www.wireshark.org/security/wnpa-sec-2020-12.html
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00038.html

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