CVE-2021-27500

HIGHNVD 7.57.5—

7.5

A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 33.2%
KEV: Not listed

Published

May 12, 2022

Last Modified

November 21, 2024

References (4)

ics-cert@hqhttps://github.com/EIPStackGroup/OpENer
ics-cert@hqhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-105-02
af854a3a-2127-422b-91ae-364da2661108https://github.com/EIPStackGroup/OpENer
af854a3a-2127-422b-91ae-364da2661108https://www.cisa.gov/uscert/ics/advisories/icsa-21-105-02

Weakness Classification(1)

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

CWE-617

Data Freshness Timeline

(refreshed 11× in last 7d / 18× 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.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
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 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 08:55 UTCEG score recompute
2026-05-23 08:55 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-27500?

CVE-2021-27500 is a high vulnerability published on May 12, 2022. A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.

When was CVE-2021-27500 disclosed?

CVE-2021-27500 was first published in the National Vulnerability Database on May 12, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-27500 actively exploited?

CVE-2021-27500 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-27500?

CVE-2021-27500 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-27500?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27500, 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-2021-27500

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CVE-2021-27500

📅 Published

🔄 Last Modified

🔗 References (4)