How severe is CVE-2021-42583?

CVE-2021-42583 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-42583 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42583?

CVE-2021-42583 affects Foxcpp Maddy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42583?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-42583 published?

CVE-2021-42583 was published on 2021-12-28 and last updated on 2026-06-17.

CVE-2021-42583

CVE-2021-42583 is a high-severity vulnerability in Foxcpp Maddy with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Foxcpp Maddy
Published: 2021-12-28
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-42583?: CVE-2021-42583 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-42583 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42583?: CVE-2021-42583 affects Foxcpp Maddy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42583?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-42583 published?: CVE-2021-42583 was published on 2021-12-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:foxcpp:maddy:*:*:*:*:*:*:*:*

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