CVE-2021-22600 [Exploited] | Netapp 8300 FIRMWARE

CVE-2021-22600 is rated Critical Active Threat (88.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 5.92%, 92th percentile). CISA KEV confirms active exploitation (added 2022-04-11) affecting Linux / Kernel. a weakness (CWE-415) Unauthenticated remote administrative access may be possible. EPSS rose +5.74% over the last day, indicating growing attacker interest. The CISA remediation deadline has passed—treat as an emergency patch priority.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.18%	5.92%	+5.74%
2	2026-05-01	0.13%	0.18%	+0.05%
3	2026-02-13	—	0.13%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.18%

5.92%

+5.74%

2026-05-01

0.13%

0.18%

+0.05%

2026-02-13

—

0.13%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.6	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	0.8	5.3	[email protected]
7.0	3.1	HIGH	`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. 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:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.0	5.9	[email protected]
7.2	2.0	HIGH	`AV:L/AC:L/Au:N/C:C/I:C/A:C` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:C) Complete confidentiality impact. Integrity impact (I:C) Complete integrity impact. Availability impact (A:C) Complete availability impact.	3.9	10.0	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.6

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

0.8

5.3

[email protected]

7.0

3.1

HIGH

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
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:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.0

5.9

[email protected]

7.2

2.0

HIGH

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

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:C): Complete confidentiality impact.
Integrity impact (I:C): Complete integrity impact.
Availability impact (A:C): Complete availability impact.

3.9

10.0

[email protected]

OS Trackers for CVE-2021-22600

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2021-22600 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2021-22600
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2021-22600
`suse`	high	—	https://www.suse.com/security/cve/CVE-2021-22600/
`ubuntu`	high	CVE-2021-22600 high priority: Ubuntu including 167 source packages (linux, linux-allwinner, …), 2042 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1576, released 209, not-affected 202, ignored 55.	https://ubuntu.com/security/CVE-2021-22600

Affected software / configurations for CVE-2021-22600

Vendor	Product	Version	Raw CPE
netapp	8300_firmware	—	cpe:2.3:o:netapp:8300_firmware:-:::::::*
netapp	8700_firmware	—	cpe:2.3:o:netapp:8700_firmware:-:::::::*
netapp	a400_firmware	—	cpe:2.3:o:netapp:a400_firmware:-:::::::*
netapp	c400_firmware	—	cpe:2.3:o:netapp:c400_firmware:-:::::::*
linux	linux_kernel	>= 4.14.175, < 4.14.259	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.19.114, < 4.19.222	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.4.29, < 5.4.168	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5.14, < 5.10.88	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.11	cpe:2.3:o:linux:linux_kernel::::::::
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*
netapp	h410c_firmware	—	cpe:2.3:o:netapp:h410c_firmware:-:::::::*
netapp	h300s_firmware	—	cpe:2.3:o:netapp:h300s_firmware:-:::::::*
netapp	h500s_firmware	—	cpe:2.3:o:netapp:h500s_firmware:-:::::::*
netapp	h700s_firmware	—	cpe:2.3:o:netapp:h700s_firmware:-:::::::*
netapp	h410s_firmware	—	cpe:2.3:o:netapp:h410s_firmware:-:::::::*

References for CVE-2021-22600

URL	Tags
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755	Mailing List Patch
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html	Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20230110-0002/	Third Party Advisory
https://www.debian.org/security/2022/dsa-5096	Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22600	US Government Resource

URL

CVE-2021-22600 | Double Free in net/packet/af_packet.c leading to priviledge escalation

CISA KEV Record for CVE-2021-22600

Exploit prediction scoring system (EPSS) score for CVE-2021-22600

Common vulnerability scoring system (CVSS) metrics for CVE-2021-22600

Weakness enumeration for CVE-2021-22600

OS Trackers for CVE-2021-22600

Affected software / configurations for CVE-2021-22600

References for CVE-2021-22600