CVE-2020-36476

HIGHNVD 7.57.5—

7.5

An issue was discovered in Mbed TLS before 2.24.0 (and before 2.16.8 LTS and before 2.7.17 LTS). There is missing zeroization of plaintext buffers in mbedtls_ssl_read to erase unused application data from memory.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 71.8%
KEV: Not listed

Published

August 23, 2021

Last Modified

November 21, 2024

References (10)

cve@mitrehttps://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8
cve@mitrehttps://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0
cve@mitrehttps://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17
cve@mitrehttps://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
af854a3a-2127-422b-91ae-364da2661108https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8
af854a3a-2127-422b-91ae-364da2661108https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0
af854a3a-2127-422b-91ae-364da2661108https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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.

2026-05-27 13:39 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 11:43 UTCEG score recompute
2026-05-26 11:43 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 14:21 UTCOSV refresh

Frequently asked(5)

What is CVE-2020-36476?

CVE-2020-36476 is a high vulnerability published on August 23, 2021. An issue was discovered in Mbed TLS before 2.24.0 (and before 2.16.8 LTS and before 2.7.17 LTS). There is missing zeroization of plaintext buffers in mbedtlssslread to erase unused application data from memory.

When was CVE-2020-36476 disclosed?

CVE-2020-36476 was first published in the National Vulnerability Database on August 23, 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-2020-36476 actively exploited?

CVE-2020-36476 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-36476?

CVE-2020-36476 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2020-36476?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-36476, 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-2020-36476

📅 Published

🔄 Last Modified

🔗 References (10)