How severe is CVE-2021-42216?

CVE-2021-42216 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-42216 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42216?

CVE-2021-42216 affects Anonaddy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42216?

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

When was CVE-2021-42216 published?

CVE-2021-42216 was published on 2021-12-15 and last updated on 2026-07-05.

CVE-2021-42216

CVE-2021-42216 is a critical-severity vulnerability in Anonaddy with a CVSS 3.x base score of 9.8. 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-326.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-326
Affected product: Anonaddy
Published: 2021-12-15
Last modified: 2026-07-05

Description

A Broken or Risky Cryptographic Algorithm exists in AnonAddy 0.8.5 via VerificationController.php.

Frequently asked questions

What is CVE-2021-42216?: A Broken or Risky Cryptographic Algorithm exists in AnonAddy 0.8.5 via VerificationController.php.
How severe is CVE-2021-42216?: CVE-2021-42216 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-42216 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42216?: CVE-2021-42216 affects Anonaddy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42216?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-42216 published?: CVE-2021-42216 was published on 2021-12-15 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:anonaddy:anonaddy:0.8.5:*:*:*:*:*:*:*

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