CVE-2021-21388 [High] | Input Validation Bypass in Systeminformation

systeminformation is an open source system and OS information library for node.js. A command injection vulnerability has been discovered in versions of systeminformation prior to 5.6.4. The issue has been fixed with a parameter check on user input. Please upgrade to version >= 5.6.4. If you cannot upgrade, be sure to check or sanitize service parameters that are passed to si.inetLatency(), si.inetChecksite(), si.services(), si.processLoad() and other commands. Only allow strings, reject any arrays. String sanitation works as expected.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-21	1.99%	0.62%	-1.37%
2	2025-11-18	0.62%	1.99%	+1.37%
3	2025-03-30	—	0.62%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

1.99%

0.62%

-1.37%

2025-11-18

0.62%

1.99%

+1.37%

2025-03-30

—

0.62%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.9	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:H` 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: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:H) Serious risk that confidential data gets exposed in a big way. 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.	2.3	6.0	[email protected]
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` 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: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.	3.9	5.9	[email protected]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/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:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.9

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:H 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: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:H): Serious risk that confidential data gets exposed in a big way.
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.

2.3

6.0

[email protected]

9.8

3.1

CRITICAL

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

3.9

5.9

[email protected]

7.5

2.0

HIGH

AV:N/AC:L/Au:N/C:P/I:P/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:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

6.4

[email protected]

OS Trackers for CVE-2021-21388

vendor	priority	summary	link
`debian`	unimportant	CVE-2021-21388 unimportant priority: Debian including 1 source packages (node-systeminformation), 2 status rows across 2 suites (forky, sid): resolved 2.	https://security-tracker.debian.org/tracker/CVE-2021-21388

Affected software / configurations for CVE-2021-21388

Vendor	Product	Version	Raw CPE
systeminformation	systeminformation	< 5.6.4	cpe:2.3:a:systeminformation:systeminformation::::::node.js::*

References for CVE-2021-21388

URL	Tags
https://github.com/sebhildebrandt/systeminformation/commit/01ef56cd5824ed6da1c11b37013a027fdef67524	Patch Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/commit/0be6fcd575c05687d1076d5cd6d75af2ebae5a46	Patch Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/commit/7922366d707de7f20995fc8e30ac3153636bf35f	Patch Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-jff2-qjw8-5476	Third Party Advisory
https://www.npmjs.com/package/systeminformation	Product Third Party Advisory

URL

CVE-2021-21388 | Command Injection Vulnerability in systeminformation

Exploit prediction scoring system (EPSS) score for CVE-2021-21388

Common vulnerability scoring system (CVSS) metrics for CVE-2021-21388

Weakness enumeration for CVE-2021-21388

GitHub Security Advisory for CVE-2021-21388

OS Trackers for CVE-2021-21388

Affected software / configurations for CVE-2021-21388

References for CVE-2021-21388