CVE-2020-25866

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-10-06 · updated 2026-06-17
Weakness: CWE-476

Description

In Wireshark 3.2.0 to 3.2.6 and 3.0.0 to 3.0.13, the BLIP protocol dissector has a NULL pointer dereference because a buffer was sized for compressed (not uncompressed) messages. This was addressed in epan/dissectors/packet-blip.c by allowing reasonable compression ratios and rejecting ZIP bombs.

Affected products

Fedoraproject Fedora: 31, 32, 33
openSUSE Leap: 15.1, 15.2
Oracle Corporation Oracle ZFS Storage Appliance Kit: 8.8
Wireshark Foundation Wireshark: 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/4a948427100b6c109f4ec7b4361f0d2aec5e5c3f
https://gitlab.com/wireshark/wireshark/-/issues/16866
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-2020-13.html
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/4a948427100b6c109f4ec7b4361f0d2aec5e5c3f

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