5.5
MEDIUM CVSS 3.1
CVE-2020-12872
Yaws TLS Ciphers Sweet32
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.

INFO

Published Date :

May 15, 2020, 7:15 p.m.

Last Modified :

Nov. 21, 2024, 5 a.m.

Remotely Exploit :

No

Source :

[email protected]
Affected Products

The following products are affected by CVE-2020-12872 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Yaws yaws
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 LOW [email protected]
CVSS 3.1 MEDIUM [email protected]
Public PoC/Exploit Available at Github

CVE-2020-12872 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-12872.

URL Resource
https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075 Exploit Third Party Advisory
https://github.com/erlyaws/yaws/issues/402 Issue Tracking Third Party Advisory
https://github.com/erlyaws/yaws/releases Release 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-L2075 Exploit Third Party Advisory
https://github.com/erlyaws/yaws/issues/402 Issue Tracking Third Party Advisory
https://github.com/erlyaws/yaws/releases Release Notes Third Party Advisory
https://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70
https://sweet32.info/ Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-12872 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2020-12872 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
Nissiuser/Vulnerability-Scan-Report

Sanitized OpenVAS vulnerability scan report of a home router. Sensitive details removed for safe public sharing.

Updated: 1 week ago
0 stars 0 fork 0 watcher
Born at : Aug. 10, 2025, 1:10 p.m. This repo has been linked 17 different CVEs too.
Profile Photo
Officerwasu/Elevate-Labs-Task-3

vulnerability assessment with openvas

Updated: 1 month, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : June 26, 2025, 7:49 a.m. This repo has been linked 11 different CVEs too.
Profile Photo
catsploit/catsploit

None

Python Shell PDDL

Updated: 1 month, 2 weeks ago
313 stars 48 fork 48 watcher
Born at : July 11, 2023, 7:48 a.m. This repo has been linked 9 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-12872 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2020-12872 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075
    Added Reference https://github.com/erlyaws/yaws/issues/402
    Added Reference https://github.com/erlyaws/yaws/releases
    Added Reference https://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70
    Added Reference https://sweet32.info/
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://medium.com/%40charlielabs101/cve-2020-12872-df315411aa70 [No types assigned]
    Removed Reference MITRE https://medium.com/@charlielabs101/cve-2020-12872-df315411aa70
  • Modified Analysis by [email protected]

    Jan. 20, 2023

    Action Type Old Value New Value
    Changed Reference Type https://github.com/erlyaws/yaws/issues/402 No Types Assigned https://github.com/erlyaws/yaws/issues/402 Issue Tracking, Third Party Advisory
  • CVE Modified by [email protected]

    Sep. 14, 2020

    Action Type Old Value New Value
    Changed 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. 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.
    Added Reference https://github.com/erlyaws/yaws/issues/402 [No Types Assigned]
  • Initial Analysis by [email protected]

    May. 19, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:N/A:N)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
    Changed Reference Type https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075 No Types Assigned https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075 Exploit, Third Party Advisory
    Changed Reference Type https://github.com/erlyaws/yaws/releases No Types Assigned https://github.com/erlyaws/yaws/releases Release Notes, Third Party Advisory
    Changed Reference Type https://medium.com/@charlielabs101/cve-2020-12872-df315411aa70 No Types Assigned https://medium.com/@charlielabs101/cve-2020-12872-df315411aa70 Exploit, Third Party Advisory
    Changed Reference Type https://sweet32.info/ No Types Assigned https://sweet32.info/ Third Party Advisory
    Added CWE NIST CWE-326
    Added CPE Configuration OR *cpe:2.3:a:yaws:yaws:*:*:*:*:*:*:*:* versions from (including) 2.0.2 up to (including) 2.0.6
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 2.1
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.12 }} -0.03%

score

0.28623

percentile