CVE-2020-26575
In Wireshark through 3.2.7, the Facebook Zero Protocol (aka FBZERO) dissector could enter an infinite loop.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 3.12% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-835
- Affected
- wireshark/wireshark · fedoraproject/fedora · debian/debian linux · oracle/zfs storage appliance firmware
- Source
- cve@mitre.org
EPSS 3.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://gitlab.com/wireshark/wireshark/-/commit/3ff940652962c099b73ae3233322b8697b0d10abPatch, Third Party Advisory
- https://gitlab.com/wireshark/wireshark/-/issues/16887Broken Link
- https://gitlab.com/wireshark/wireshark/-/merge_requests/467Patch, Third Party Advisory
- https://gitlab.com/wireshark/wireshark/-/merge_requests/471Patch, Third Party Advisory
- https://gitlab.com/wireshark/wireshark/-/merge_requests/472Patch, Third Party Advisory
- https://gitlab.com/wireshark/wireshark/-/merge_requests/473Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00008.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UHZSVK7PO2LTGFQXFHFXY6SOMSQ7UPRS/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V2667E6WKVE56G66BVBVD7LJPIDOJ7K3/
- https://security.gentoo.org/glsa/202011-08Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory
- https://www.wireshark.org/security/wnpa-sec-2020-14.htmlVendor Advisory
- https://gitlab.com/wireshark/wireshark/-/commit/3ff940652962c099b73ae3233322b8697b0d10abPatch, Third Party Advisory
- https://gitlab.com/wireshark/wireshark/-/issues/16887Broken Link
- https://gitlab.com/wireshark/wireshark/-/merge_requests/467Patch, Third Party Advisory
- https://gitlab.com/wireshark/wireshark/-/merge_requests/471Patch, Third Party Advisory
- https://gitlab.com/wireshark/wireshark/-/merge_requests/472Patch, Third Party Advisory
- https://gitlab.com/wireshark/wireshark/-/merge_requests/473Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00008.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UHZSVK7PO2LTGFQXFHFXY6SOMSQ7UPRS/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V2667E6WKVE56G66BVBVD7LJPIDOJ7K3/
- https://security.gentoo.org/glsa/202011-08Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory
- https://www.wireshark.org/security/wnpa-sec-2020-14.htmlVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.