CVE-2021-30191

HIGHNVD 7.57.5—Trending — 4 sources updated this week

7.5

CODESYS V2 Web-Server before 1.1.9.20 has a a Buffer Copy without Checking the Size of the Input.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 61.4%
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=14726&token=553da5d11234bbe1ceed59969d419a71bb8c8747&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=14726&token=553da5d11234bbe1ceed59969d419a71bb8c8747&download=

Weakness Classification(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 10× in last 7d / 10× 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.

2026-05-28 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
2026-05-26 16:10 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 08:31 UTCOSV refresh

Frequently asked(5)

What is CVE-2021-30191?

CVE-2021-30191 is a high vulnerability published on May 25, 2021. CODESYS V2 Web-Server before 1.1.9.20 has a a Buffer Copy without Checking the Size of the Input.

When was CVE-2021-30191 disclosed?

CVE-2021-30191 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-2021-30191 actively exploited?

CVE-2021-30191 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-30191?

CVE-2021-30191 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-30191?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30191, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-30191

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Is Your Infrastructure Affected by CVE-2021-30191?

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CVE-2021-30191

📅 Published

🔄 Last Modified

🔗 References (4)