CVE-2020-12872

Name: CVE-2020-12872
Creator: NVD / NIST
Published: 2020-05-15T19:15:12.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.39%

Last modified Jun 17, 2026

CVE-2020-12872 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.39%

31.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-326

Affected Software

Vendor	Product	Versions
Yaws	Yaws	>= 2.0.2, <= 2.0.6

References

https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075Exploit, Third Party Advisory
https://github.com/erlyaws/yaws/issues/402Issue Tracking, Third Party Advisory
https://github.com/erlyaws/yaws/releasesRelease Notes, Third Party Advisory
https://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70
https://sweet32.info/Third Party Advisory
https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075Exploit, Third Party Advisory
https://github.com/erlyaws/yaws/issues/402Issue Tracking, Third Party Advisory
https://github.com/erlyaws/yaws/releasesRelease Notes, Third Party Advisory
https://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70
https://sweet32.info/Third Party Advisory

Timeline

Published: May 15, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12872?

How severe is CVE-2020-12872?

CVE-2020-12872 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12872?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-12872?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST