CVE-2021-34415

HIGHNVD 7.57.5—

7.5

The Zone Controller service in the Zoom On-Premise Meeting Connector Controller before version 4.6.358.20210205 does not verify the cnt field sent in incoming network packets, which leads to exhaustion of resources and system crash.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 58.9%
KEV: Not listed

Published

September 27, 2021

Last Modified

November 21, 2024

References (2)

security@zoomhttps://explore.zoom.us/en/trust/security/security-bulletin/
af854a3a-2127-422b-91ae-364da2661108https://explore.zoom.us/en/trust/security/security-bulletin/

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× 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.

2026-06-02 20:11 UTCepss_batch
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2026-06-01 13:50 UTCepss_batch
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2026-05-31 22:29 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch
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2026-05-28 13:43 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 09:54 UTCEG score recompute
2026-05-26 09:53 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-34415?

CVE-2021-34415 is a high vulnerability published on September 27, 2021. The Zone Controller service in the Zoom On-Premise Meeting Connector Controller before version 4.6.358.20210205 does not verify the cnt field sent in incoming network packets, which leads to exhaustion of resources and system crash.

When was CVE-2021-34415 disclosed?

CVE-2021-34415 was first published in the National Vulnerability Database on September 27, 2021, 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-2021-34415 actively exploited?

CVE-2021-34415 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 58.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-34415?

CVE-2021-34415 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-34415?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-34415, 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-2021-34415

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-34415?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)