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CVE-2020-26575

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

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

3.12%Up 0.4 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

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.

Record
CVE-2020-26575
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-835
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2020-26575
Updated
2026-11-02
EUVDEUVD-2020-19120 No score

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.

Record
EUVD-2020-19120
Updated
2026-11-03
GitHub AdvisoriesGHSA-vw2j-3xrw-2q58 No score

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

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.

Record
GHSA-vw2j-3xrw-2q58
Weakness
CWE-835
Updated
2026-11-02
OSVALPINE-CVE-2020-26575 7.5

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.

Record
ALPINE-CVE-2020-26575
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSV 7.5

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.

Record
CVE-2020-26575
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 7 moreShow less
OSVDEBIAN-CVE-2020-26575 7.5

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.

Record
DEBIAN-CVE-2020-26575
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVOESA-2021-1076 7.5

wireshark security update

Wireshark is an open source tool for profiling network traffic and analyzing packets. Such a tool is often referred to as a network analyzer, network protocol analyzer or sniffer. Wireshark, formerly known as Ethereal, can be used to examine the details of traffic at a variety of levels ranging from connection-level information to the bits that make up a single packet. Packet capture can provide a network administrator with information about individual packets such as transmit time, source, destination, protocol type and header data. This information can be useful for evaluating security events and troubleshooting network security device issues.

Security Fix(es):

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.(CVE-2020-26575)

Record
OESA-2021-1076
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-26575 7.5

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.

Record
UBUNTU-CVE-2020-26575
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2020:2076-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

  • wireshark was updated to 3.2.8:
    • CVE-2020-26575: Fixed an issue where FBZERO dissector was entering in infinite loop (bsc#1177406)
    • CVE-2020-28030: Fixed an issue where GQUIC dissector was crashing (bsc#1178291)
    • Infinite memory allocation while parsing this tcp packet

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2020:2076-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:2107-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

  • wireshark was updated to 3.2.8:
    • CVE-2020-26575: Fixed an issue where FBZERO dissector was entering in infinite loop (bsc#1177406)
    • CVE-2020-28030: Fixed an issue where GQUIC dissector was crashing (bsc#1178291)
    • Infinite memory allocation while parsing this tcp packet

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2020:2107-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11513-1 No score

libwireshark14-3.4.8-1.2 on GA media

These are all security issues fixed in the libwireshark14-3.4.8-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11513-1
Updated
2026-11-02
OSVSUSE-SU-2020:3376-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

  • wireshark was updated to 3.2.8:
    • CVE-2020-26575: Fixed an issue where FBZERO dissector was entering in infinite loop (bsc#1177406)
    • CVE-2020-28030: Fixed an issue where GQUIC dissector was crashing (bsc#1178291)
    • Infinite memory allocation while parsing this tcp packet
Record
SUSE-SU-2020:3376-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
wireshark
Alpine:v3.12
 before 3.2.8-r0
3.2.8-r0
wireshark
Alpine:v3.13
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.14
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.15
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.16
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.17
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.18
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.19
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.20
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.21
 before 3.4.0-r0
3.4.0-r0
Show 20 moreShow less
Affected packages
PackageAffectedFixed
wireshark
Alpine:v3.22
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.23
 before 3.4.0-r0
3.4.0-r0
wireshark
Alpine:v3.24
 before 3.4.0-r0
3.4.0-r0
wireshark
Debian:12
 before 3.2.8-0.1
3.2.8-0.1
wireshark
Debian:13
 before 3.2.8-0.1
3.2.8-0.1
wireshark
Debian:14
 before 3.2.8-0.1
3.2.8-0.1
wireshark
Debian:9
From an advisory covering 17 CVEs
 before 2.6.20-0+deb9u1, plus listed versions
2.2.6+g32dac6a-22.2.6+g32dac6a-2+deb9u12.2.6+g32dac6a-2+deb9u22.2.6+g32dac6a-2+deb9u32.2.7-1
Show 24 moreShow less
2.4.0-12.4.1-12.4.2-12.4.3-12.4.4-12.4.5-12.4.6-12.6.1-12.6.10-12.6.2-12.6.2-22.6.3-12.6.3-1~deb9u12.6.4-12.6.4-22.6.5-12.6.5-1~deb9u12.6.6-12.6.7-12.6.7-1~deb9u12.6.8-12.6.8-1.12.6.8-1.1~deb9u12.6.9-1
2.6.20-0+deb9u1
wireshark
openEuler:20.03-LTS
 before 2.6.2-18.oe1
2.6.2-18.oe1
wireshark
openEuler:20.03-LTS-SP1
 before 2.6.2-18.oe1
2.6.2-18.oe1
wireshark
SUSE:Linux Enterprise Module for Basesystem 15 SP1
From an advisory covering 2 CVEs
 before 3.2.8-3.44.1
3.2.8-3.44.1
wireshark
SUSE:Linux Enterprise Module for Basesystem 15 SP2
From an advisory covering 2 CVEs
 before 3.2.8-3.44.1
3.2.8-3.44.1
wireshark
SUSE:Linux Enterprise Module for Desktop Applications 15 SP1
From an advisory covering 2 CVEs
 before 3.2.8-3.44.1
3.2.8-3.44.1
wireshark
SUSE:Linux Enterprise Module for Desktop Applications 15 SP2
From an advisory covering 2 CVEs
 before 3.2.8-3.44.1
3.2.8-3.44.1
wireshark
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1.10.2-11.10.3-11.10.5-1ubuntu11.10.5-21.10.6-1
Show 9 moreShow less
1.12.1+g01b65bf-4+deb8u11ubuntu0.14.04.12.6.3-1~ubuntu14.04.12.6.4-2~ubuntu14.04.12.6.5-1~ubuntu14.04.12.6.6-1~ubuntu14.04.02.6.8-1~ubuntu14.04.0~esm12.6.10-1~ubuntu14.04.0~esm12.6.10-1~ubuntu14.04.0~esm22.6.10-1~ubuntu14.04.0~esm3
 None known
wireshark
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.12.7+g7fc8978-11.12.8+g5b6e543-22.0.1+g59ea380-3build12.0.2+ga16e22e-12.2.6+g32dac6a-2ubuntu0.16.04
Show 8 moreShow less
2.6.3-1~ubuntu16.04.12.6.4-2~ubuntu16.04.02.6.5-1~ubuntu16.04.02.6.6-1~ubuntu16.04.02.6.8-1~ubuntu16.04.02.6.10-1~ubuntu16.04.02.6.10-1~ubuntu16.04.0+esm12.6.10-1~ubuntu16.04.0+esm2
 None known
wireshark
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2.4.2-12.4.3-12.4.4-12.4.5-12.6.3-1~ubuntu18.04.1
Show 7 moreShow less
2.6.4-2~ubuntu18.04.02.6.5-1~ubuntu18.04.02.6.6-1~ubuntu18.04.02.6.8-1~ubuntu18.04.02.6.10-1~ubuntu18.04.02.6.10-1~ubuntu18.04.0+esm12.6.10-1~ubuntu18.04.0+esm2
 None known
wireshark
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
3.0.5-13.0.7-13.2.1-13.2.2-13.2.3-13.2.3-1ubuntu0.1~esm13.2.3-1ubuntu0.1~esm2
 None known
wireshark
openSUSE:Leap 15.2
From an advisory covering 2 CVEs
 before 3.2.8-lp152.2.9.1
3.2.8-lp152.2.9.1
wireshark
openSUSE:Leap 15.1
From an advisory covering 2 CVEs
 before 3.2.8-lp151.2.18.1
3.2.8-lp151.2.18.1
wireshark
openSUSE:Tumbleweed
From an advisory covering 163 CVEs
 before 3.4.8-1.2
3.4.8-1.2

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-26575 is a high vulnerability (CVSS 7.5) in Wireshark, published October 6, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.12%, the 87th percentile. Fixed in wireshark 3.2.8-r0.

References

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