CVE-2020-26422 [Low] | Denial of Service in Wireshark

CVE-2020-26422 is rated Moderate Risk (50.9/100): CVSS Low severity, with high exploitation likelihood (EPSS 4.67%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.36% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.31%	4.67%	+4.36%
2	2025-11-21	0.35%	0.31%	-0.05%
3	2025-11-18	—	0.35%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.31%

4.67%

+4.36%

2025-11-21

0.35%

0.31%

-0.05%

2025-11-18

—

0.35%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
3.7	3.1	LOW	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	2.2	1.4	[email protected]
5.3	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	3.9	1.4	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/I:N/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

3.7

3.1

LOW

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

2.2

1.4

[email protected]

5.3

3.1

MEDIUM

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

3.9

1.4

[email protected]

5.0

2.0

MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

2.9

[email protected]

OS Trackers for CVE-2020-26422

vendor	priority	summary	link
`alpine`	medium	CVE-2020-26422: 1 source package rows (wireshark); 11 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 4.	https://security.alpinelinux.org/vuln/CVE-2020-26422
`debian`	unimportant	CVE-2020-26422 unimportant priority: Debian including 1 source packages (wireshark), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2020-26422
`gentoo`	normal	CVE-2020-26422: 1 GLSA(s) (202101-12), 1 atom(s) (net-analyzer/wireshark); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-26422
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2020-26422
`suse`	medium	CVE-2020-26422 severity moderate: SUSE including 86 source package names (libQt5Multimedia5-5.9.7-7.2.1, libqt5-qtmultimedia-devel-5.9.7-7.2.1, …), 493 product×package rows across 73 product lines (HPE Helion OpenStack 8, Image SLES15-SP3-SAP-Azure-LI-BYOS-Production, … (73 product lines)): Fixed 390, Known Not Affected 103.	https://www.suse.com/security/cve/CVE-2020-26422/
`ubuntu`	medium	CVE-2020-26422 medium priority: Ubuntu including 1 source packages (wireshark), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 8, needs-triage 8.	https://ubuntu.com/security/CVE-2020-26422

Affected software / configurations for CVE-2020-26422

Vendor	Product	Version	Raw CPE
wireshark	wireshark	3.4.0	cpe:2.3:a:wireshark:wireshark:3.4.0:::::::*
wireshark	wireshark	3.4.1	cpe:2.3:a:wireshark:wireshark:3.4.1:::::::*
oracle	zfs_storage_appliance_kit	8.8	cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:::::::*

References for CVE-2020-26422

URL	Tags
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26422.json	Third Party Advisory
https://gitlab.com/wireshark/wireshark/-/issues/17073	Issue Tracking Third Party Advisory
https://security.gentoo.org/glsa/202101-12	Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html	Patch Third Party Advisory
https://www.wireshark.org/security/wnpa-sec-2020-20.html	Vendor Advisory

URL

CVE-2020-26422

Exploit prediction scoring system (EPSS) score for CVE-2020-26422

Common vulnerability scoring system (CVSS) metrics for CVE-2020-26422

Weakness enumeration for CVE-2020-26422

OS Trackers for CVE-2020-26422

Affected software / configurations for CVE-2020-26422

References for CVE-2020-26422