What’s Vulnerable › Vulnerabilities

CVE-2020-12872

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-05-15 · updated 2026-06-17
• Weakness: CWE-326

Description

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.

Affected products

• yaws: from 2.0.2 through 2.0.6

References

• https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075
• https://github.com/erlyaws/yaws/issues/402
• https://github.com/erlyaws/yaws/releases
• https://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70
• https://sweet32.info/
• https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075
• https://github.com/erlyaws/yaws/issues/402
• https://github.com/erlyaws/yaws/releases
• https://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70
• https://sweet32.info/

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