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CVE-2020-12872

20
FAUCET Score

CVE-2020-12872 describes a vulnerability in Yaws versions through 2.0.7 where the application loads obsolete TLS ciphers, specifically those susceptible to Sweet32 attacks, when running on an Erlang/OTP virtual machine older than version 21.0. This medium-severity vulnerability (CVSS 5.5) has a local attack vector with low complexity, potentially leading to high confidentiality impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.2, <= 2.0.6CPE matchmatch criteria
cpe:2.3:a:yaws:yaws:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 87th percentile among its peer group of 15,937 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl
ExploitThird Party Advisory
github.com / erlyaws/yaws/issues/402
Issue TrackingThird Party Advisory
github.com / erlyaws/yaws/releases
Release NotesThird Party Advisory
medium.com / %40charlielabs101/cve-2020-12872-df315411aa70
sweet32.info
Third Party Advisory