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Fencer Vulns
high 7.5

CVE-2020-26575 json

In Wireshark through 3.2.7, the Facebook Zero Protocol (aka FBZERO) dissector could enter an infinite loop.

published 2020-10-06 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-19120

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

In Wireshark through 3.2.7, the Facebook Zero Protocol (aka FBZERO) dissector could enter an infinite loop. This was addressed in epan/dissectors/packet-fbzero.c by correcting the implementation of offset advancement.

Patch / fix

  • wireshark Debian 14, Debian 13, Debian 12 3.2.8-0.1

debian advisories DEBIAN-CVE-2020-26575

  • wireshark SLE Module for Desktop Applications 15 SP2, SLE Module for Desktop Applications 15 SP1, SLE Module for Basesystem 15 SP2 +1 more 3.2.8-3.44.1

suse advisories SUSE-SU-2020:3376-1

  • wireshark openSUSE Tumbleweed 3.4.8-1.2
  • wireshark openSUSE Leap 15.1 3.2.8-lp151.2.18.1
  • wireshark openSUSE Leap 15.2 3.2.8-lp152.2.9.1

opensuse advisories openSUSE-SU-2024:11513-1openSUSE-SU-2020:2107-1openSUSE-SU-2020:2076-1

  • wireshark Alpine 3.12 3.2.8-r0
  • wireshark Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 3.4.0-r0

alpine advisories ALPINE-CVE-2020-26575

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

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-2020-26575 updated cvss 7.5

wireshark: FBZERO dissector could enter an infinite loop

  • Red Hat Enterprise Linux 8 wireshark, wireshark-cli
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 wireshark Red Hat Enterprise Linux 6 wireshark, wireshark-gnome Red Hat Enterprise Linux 7 wireshark, wireshark-gnome
    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

3.12% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

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
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Vulns 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.