CVE-2020-12872

MEDIUMNVD 5.55.5—

5.5

yaws_config.erl in Yaws through 2.0.2 and/or 2.0.7 loads obsolete TLS ciphers, as demonstrated by ones that allow Sweet32 attacks, if running on an Erlang/OTP virtual machine with a version less than 21.0.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 9.8%
KEV: Not listed

Published

May 15, 2020

Last Modified

November 21, 2024

References (10)

cve@mitrehttps://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075
cve@mitrehttps://github.com/erlyaws/yaws/issues/402
cve@mitrehttps://github.com/erlyaws/yaws/releases
cve@mitrehttps://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70
cve@mitrehttps://sweet32.info/
af854a3a-2127-422b-91ae-364da2661108https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075
af854a3a-2127-422b-91ae-364da2661108https://github.com/erlyaws/yaws/issues/402
af854a3a-2127-422b-91ae-364da2661108https://github.com/erlyaws/yaws/releases
af854a3a-2127-422b-91ae-364da2661108https://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70
af854a3a-2127-422b-91ae-364da2661108https://sweet32.info/

Weakness Classification(1)

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

CWE-326Inadequate Encryption Strength

Data Freshness Timeline

(refreshed 11× 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.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 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
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 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 03:33 UTCEG score recompute
2026-05-27 03:33 UTCGHSA enrichment
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
2026-05-26 03:16 UTCOSV refresh

Frequently asked(5)

What is CVE-2020-12872?

CVE-2020-12872 is a medium vulnerability published on May 15, 2020. yaws_config.erl in Yaws through 2.0.2 and/or 2.0.7 loads obsolete TLS ciphers, as demonstrated by ones that allow Sweet32 attacks, if running on an Erlang/OTP virtual machine with a version less than 21.0.

When was CVE-2020-12872 disclosed?

CVE-2020-12872 was first published in the National Vulnerability Database on May 15, 2020, 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-2020-12872 actively exploited?

CVE-2020-12872 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-12872?

CVE-2020-12872 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2020-12872?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-12872, 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-2020-12872

📅 Published

🔄 Last Modified

🔗 References (10)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-12872?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (10)

Frequently asked(5)

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