CVE-2021-30187

MEDIUMNVD 5.35.3—

5.3

CODESYS V2 runtime system SP before 2.4.7.55 has Improper Neutralization of Special Elements used in an OS Command.

CVSS v3: 5.3
EG Score: 5.3(medium)
EPSS: 30.1%
KEV: Not listed

Published

May 25, 2021

Last Modified

August 15, 2025

References (4)

cve@mitrehttps://customers.codesys.com/index.php
cve@mitrehttps://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14727&token=25159b0fc4355f4c6bc2e074a519a9d0cdb23fbb&download=
af854a3a-2127-422b-91ae-364da2661108https://customers.codesys.com/index.php
af854a3a-2127-422b-91ae-364da2661108https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14727&token=25159b0fc4355f4c6bc2e074a519a9d0cdb23fbb&download=

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-78OS Command Injection

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:45 UTCepss_batch
2026-06-05 22:45 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
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2026-06-02 20:11 UTCepss_batch
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2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 16:10 UTCEG score recompute

Frequently asked(5)

What is CVE-2021-30187?

CVE-2021-30187 is a medium vulnerability published on May 25, 2021. CODESYS V2 runtime system SP before 2.4.7.55 has Improper Neutralization of Special Elements used in an OS Command.

When was CVE-2021-30187 disclosed?

CVE-2021-30187 was first published in the National Vulnerability Database on May 25, 2021, with the most recent update on August 15, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-30187 actively exploited?

CVE-2021-30187 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-30187?

CVE-2021-30187 has a CVSS v3 base score of 5.3 (NVD).

How do I remediate CVE-2021-30187?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30187, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-30187

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-30187?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)