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Fencer Intel
high 7.5

CVE-2020-25866 json

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…

published 6y ago modified 4mo ago also EUVD-2020-18498

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.0%
EPSS 4.0% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • wireshark Debian 14, Debian 13, Debian 12 3.2.7-1

debian advisories DEBIAN-CVE-2020-25866

  • wireshark SLE Module for Desktop Applications 15 SP2, SLE Module for Desktop Applications 15 SP1, SLE Module for Basesystem 15 SP2 +1 more 3.2.7-3.41.1

suse advisories SUSE-SU-2020:3166-1

  • wireshark openSUSE Tumbleweed 3.4.8-1.2
  • wireshark openSUSE Leap 15.2 3.2.7-lp152.2.6.1
  • wireshark openSUSE Leap 15.1 3.2.7-lp151.2.15.1

opensuse advisories openSUSE-SU-2024:11513-1openSUSE-SU-2020:1882-1openSUSE-SU-2020:1878-1

  • wireshark Alpine 3.11, Alpine 3.10 3.0.14-r0
  • wireshark Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 3.2.7-r0

alpine advisories ALPINE-CVE-2020-25866

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-25866 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-25866 updated cvss 7.5

wireshark: BLIP dissector crash (wnpa-sec-2020-13)

  • Red Hat Enterprise Linux 5 wireshark Red Hat Enterprise Linux 6 wireshark, wireshark-gnome Red Hat Enterprise Linux 7 wireshark, wireshark-gnome Red Hat Enterprise Linux 8 wireshark, wireshark-cli
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.99% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • gitlab.com https://gitlab.com/wireshark/wireshark/-/issues/16866 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.