CVE-2020-20021

HIGHNVD 7.57.5—Elevated

7.5

An issue discovered in MikroTik Router v6.46.3 and earlier allows attacker to cause denial of service via misconfiguration in the SSH daemon.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 25.4%
KEV: Not listed

Published

July 12, 2023

Last Modified

November 21, 2024

References (6)

cve@mitrehttp://mikrotik.com
cve@mitrehttp://router.com
cve@mitrehttps://www.exploit-db.com/exploits/48228
af854a3a-2127-422b-91ae-364da2661108http://mikrotik.com
af854a3a-2127-422b-91ae-364da2661108http://router.com
af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/48228

Weakness Classification(1)

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

CWE-400Uncontrolled Resource Consumption (Denial of Service)

Data Freshness Timeline

(refreshed 9× in last 7d / 19× 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.

2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 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
2026-05-29 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
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 21:22 UTCEG score recompute
2026-05-24 21:22 UTCGHSA enrichment
2026-05-24 16:48 UTCepss_batch

Frequently asked(5)

What is CVE-2020-20021?

CVE-2020-20021 is a high vulnerability published on July 12, 2023. An issue discovered in MikroTik Router v6.46.3 and earlier allows attacker to cause denial of service via misconfiguration in the SSH daemon.

When was CVE-2020-20021 disclosed?

CVE-2020-20021 was first published in the National Vulnerability Database on July 12, 2023, 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-2020-20021 actively exploited?

CVE-2020-20021 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-20021?

CVE-2020-20021 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2020-20021?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-20021, 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-2020-20021

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-20021?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (6)

Frequently asked(5)

Related CVEs(same CWE)