MEDIUM
CVE-2020-12872
CWE-326Published: May 15, 2020· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official 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.
Technical Analysis
CVE-2020-12872 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
yaws1 product(s)
yaws
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
ADVISORYhttps://sweet32.info/
ADVISORYhttps://sweet32.info/
All References (10)
→
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
Quick Facts
CVE IDCVE-2020-12872
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-326
CISA KEVNo
Affected1 vendor(s)
PublishedMay 15, 2020
Related CVEs (CWE-326)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-12872 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.