CVE-2020-25866

Name: CVE-2020-25866
Creator: NVD / NIST
Published: 2020-10-06T15:15:15.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.89%

Last modified Jun 17, 2026

CVE-2020-25866 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.89% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.89%

88.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Wireshark	Wireshark	>= 3.0.0, <= 3.0.13
Wireshark	Wireshark	>= 3.2.0, <= 3.2.6
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Opensuse	Leap	15.1
Opensuse	Leap	15.2
Oracle	Zfs Storage Appliance Kit	8.8

References

http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00035.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00038.htmlMailing List, Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/commit/4a948427100b6c109f4ec7b4361f0d2aec5e5c3fPatch, Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/16866Exploit, Issue Tracking, Third Party Advisory
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.htmlPatch, Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2020-13.htmlVendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00035.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00038.htmlMailing List, Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/commit/4a948427100b6c109f4ec7b4361f0d2aec5e5c3fPatch, Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/16866Exploit, Issue Tracking, Third Party Advisory
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.htmlPatch, Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2020-13.htmlVendor Advisory

Timeline

Published: Oct 6, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25866?

How severe is CVE-2020-25866?

CVE-2020-25866 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.89% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25866?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-25866?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST