CVE-2021-42216Network attack vector

Unspecified impact via weak email verification hash

Published Dec 15, 2021 · Updated Jul 9, 2026

Weak cryptography in VerificationController.php in AnonAddy 0.8.5 allows attackers to cause unspecified impact via email-verification requests. The verify method compares the request's hash route value with a SHA-1 digest of the selected user's or recipient's email address. Signed-route middleware also gates the endpoint, and published sources demonstrate neither a verification bypass nor a concrete consequence.

CVSS severity9.8
Critical
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak cryptography in VerificationController.php in AnonAddy 0.8.5 allows attackers to cause unspecified impact via email-verification requests. The verify method compares the request's hash route value with a SHA-1 digest of the selected user's or recipient's email address. Signed-route middleware also gates the endpoint, and published sources demonstrate neither a verification bypass nor a concrete consequence.

The record

CVE
CVE-2021-42216
Published
Dec 15, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-326, CAPEC-112, CAPEC-192, CAPEC-20
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength
CAPEC-112Brute Force
CAPEC-192Protocol Analysis
CAPEC-20Encryption Brute Forcing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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