HOMEVULNERABILITIESCVE-2021-21388
CRITICAL

CVE-2021-21388

CWE-20Published: April 29, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-21388 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

systeminformation1 product(s)
systeminformation
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/sebhildebrandt/systeminformation/commit/01ef56cd5824ed6da1c11b37013a027fdef67524
PATCHhttps://github.com/sebhildebrandt/systeminformation/commit/0be6fcd575c05687d1076d5cd6d75af2ebae5a46
PATCHhttps://github.com/sebhildebrandt/systeminformation/commit/7922366d707de7f20995fc8e30ac3153636bf35f
PATCHhttps://github.com/sebhildebrandt/systeminformation/commit/01ef56cd5824ed6da1c11b37013a027fdef67524
PATCHhttps://github.com/sebhildebrandt/systeminformation/commit/0be6fcd575c05687d1076d5cd6d75af2ebae5a46
PATCHhttps://github.com/sebhildebrandt/systeminformation/commit/7922366d707de7f20995fc8e30ac3153636bf35f
ADVISORYhttps://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-jff2-qjw8-5476
ADVISORYhttps://www.npmjs.com/package/systeminformation
ADVISORYhttps://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-jff2-qjw8-5476
ADVISORYhttps://www.npmjs.com/package/systeminformation

All References (10)

→
https://github.com/sebhildebrandt/systeminformation/commit/01ef56cd5824ed6da1c11b37013a027fdef67524Patch · Third Party Advisory
→
https://github.com/sebhildebrandt/systeminformation/commit/0be6fcd575c05687d1076d5cd6d75af2ebae5a46Patch · Third Party Advisory
→
https://github.com/sebhildebrandt/systeminformation/commit/7922366d707de7f20995fc8e30ac3153636bf35fPatch · Third Party Advisory
→
https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-jff2-qjw8-5476Third Party Advisory
→
https://www.npmjs.com/package/systeminformationProduct · Third Party Advisory
→
https://github.com/sebhildebrandt/systeminformation/commit/01ef56cd5824ed6da1c11b37013a027fdef67524Patch · Third Party Advisory
→
https://github.com/sebhildebrandt/systeminformation/commit/0be6fcd575c05687d1076d5cd6d75af2ebae5a46Patch · Third Party Advisory
→
https://github.com/sebhildebrandt/systeminformation/commit/7922366d707de7f20995fc8e30ac3153636bf35fPatch · Third Party Advisory
→
https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-jff2-qjw8-5476Third Party Advisory
→
https://www.npmjs.com/package/systeminformationProduct · Third Party Advisory

Quick Facts

CVE IDCVE-2021-21388
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedApr 29, 2021

Related CVEs (CWE-20)

CVE-2021-23279
10.0
CVE-2008-6555
10.0
CVE-2017-16845
10.0
CVE-2020-13753
10.0
CVE-2003-1425
10.0
CVE-2011-0923
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-21388 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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