CVE-2020-12872
MEDIUMCVSS 5.5/10EPSS 0.39%
Last modified
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/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
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://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://sweet32.info/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-12872?
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.
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-12872?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST