What is CVE-2021-42583?

CVE-2021-42583 is a high-severity vulnerability in Foxcpp Maddy, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.5/10. Published 2021-12-28.

How severe is CVE-2021-42583?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Foxcpp Maddy

CVE-2021-42583

A Broken or Risky Cryptographic Algorithm exists in Max Mazurov Maddy before 0.5.2, which is an unnecessary risk that may result in the exposure of sensitive information.

Vulnerability class: POODLE (CVE-2014-3566)

Published 2021-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Foxcpp Maddy

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

github.com/foxcpp/maddy/blob/df40dce1284cd0fd0a9e8e7894029553d653d0a5/internal/… (Third Party Advisory)
github.com/foxcpp/maddy/releases/tag/v0.5.2 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-42583?: CVE-2021-42583 is a high-severity vulnerability in Foxcpp Maddy, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.5/10. Published 2021-12-28.
How severe is CVE-2021-42583?: High severity. CVSS v3 base score is 7.5 out of 10.