NVD / CVE Program· CNA GitLab

CVE-2020-26422: Buffer overflow in QUIC dissector in Wireshark 3.4.0 to 3.4.1 allows denial of service via packet injection or crafted capture file

Noroxi assessment

Priority: Monitor (action score 22/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 4.7% (FIRST EPSS); higher than 91.7% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: wireshark (openSUSE:Leap 15.2) 3.4.5-lp152.2.12.1; sbc (openSUSE:Leap 15.3) 1.3-3.2.1; wireshark (openSUSE:Leap 15.3) 3.4.5-3.53.1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to wireshark (openSUSE:Leap 15.2) 3.4.5-lp152.2.12.1; sbc (openSUSE:Leap 15.3) 1.3-3.2.1; wireshark (openSUSE:Leap 15.3) 3.4.5-3.53.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

MediumCVSS 5.3 · v3.1—No exploit Fix available

Published: Dec 21, 2020
Updated: Jun 16, 2026
EPSS: 4.7% · 91th percentile
CWE: CWE-120

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 21 / 40 · 5.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 4.7%

CNA vs NVD score

NVD: 5.3
CNA · GitLab: 3.7; 1.6 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
wireshark	wireshark	cpe:2.3:a:wireshark:wireshark
oracle	zfs storage appliance kit	cpe:2.3:a:oracle:zfs_storage_appliance_kit

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

oracle zfs storage appliance kit8.8
wireshark wireshark3.4.0
wireshark wireshark3.4.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitLab). Independent of NVD's CPE analysis and usually ahead of it.

The Wireshark Foundation Wireshark
- >=3.4.0, <3.4.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
openSUSE:Leap 15.2	wireshark	before 3.4.5-lp152.2.12.1	3.4.5-lp152.2.12.1
openSUSE:Leap 15.3	sbc	before 1.3-3.2.1	1.3-3.2.1
openSUSE:Leap 15.3	wireshark	before 3.4.5-3.53.1	3.4.5-3.53.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS	libqt5-qtmultimedia	before 5.9.7-7.2.1	5.9.7-7.2.1
SUSE:Linux Enterprise High Performance Computing 15-ESPOS	libvirt	before 4.0.0-9.37.21	4.0.0-9.37.21
SUSE:Linux Enterprise Module for Basesystem 15 SP2	sbc	before 1.3-3.2.1	1.3-3.2.1
SUSE:Linux Enterprise Module for Basesystem 15 SP2	wireshark	before 3.4.5-3.53.1	3.4.5-3.53.1

Same product

wireshark: all records

Other highest-scoring records for the same primary product.

CVE-2010-0304Multiple buffer overflows in the LWRES dissector in Wireshark 0.9.15 through 1.0.10 and 1.2.0 through 1.2.5 allow remote attackers to cause
52Plan
CVE-2014-2299Buffer overflow in the mpeg_read function in wiretap/mpeg.c in the MPEG parser in Wireshark 1.8.x before 1.8.13 and 1.10.x before 1.10.6 all
51Plan
CVE-2011-1591Stack-based buffer overflow in the DECT dissector in epan/dissectors/packet-dect.c in Wireshark 1.4.x before 1.4.5 allows remote attackers t
50Plan

Published before and after this one in the same product

← EarlierCVE-2020-26420Dec 11, 2020 · Memory leak in RTPS protocol dissector in Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet injection or crafted captur
22Monitor
← EarlierCVE-2020-26421Dec 11, 2020 · Crash in USB HID protocol dissector and possibly other dissectors in Wireshark 3.4.0 and 3.2.0 to 3.2.8 allows denial of service via packet
22Monitor
Later →CVE-2021-22173Feb 17, 2021 · Memory leak in USB HID dissector in Wireshark 3.4.0 to 3.4.2 allows denial of service via packet injection or crafted capture file
31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
opensuse:sbc	1.3-3.2.1 · openSUSE:Leap 15.3	Package registry (OSV)
opensuse:wireshark	3.4.5-lp152.2.12.1 · openSUSE:Leap 15.2	Package registry (OSV)
suse:libqt5-qtmultimedia	5.9.7-7.2.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS	Package registry (OSV)
suse:libvirt	4.0.0-9.37.21 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS	Package registry (OSV)
suse:sbc	1.3-3.2.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2	Package registry (OSV)
suse:wireshark	3.4.5-3.53.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-21-0331 · Apr 21, 2021(Oracle Güvenlik Uyarısı Yayınladı)

All national notices →

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: low · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: Low

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

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

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:44 PM UTC

For records you follow, these changes also arrive as notifications. →

References

gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26422.json

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records