CVE-2024-3676Network attack vector

Unauthenticated account creation via crafted HTTP request

Published May 14, 2024 · Updated Aug 1, 2024

Improper input validation in Proofpoint Enterprise Protection allows remote attackers to create attacker-controlled Secure Reader accounts. The Proofpoint Encryption endpoint accepts a specially crafted HTTP request without sufficient validation and provisions an additional account; Proofpoint has not disclosed the affected parameter or code path. No authentication or user interaction is required, and the limited account can send trusted email to users in administrator-configured domains.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper input validation in Proofpoint Enterprise Protection allows remote attackers to create attacker-controlled Secure Reader accounts. The Proofpoint Encryption endpoint accepts a specially crafted HTTP request without sufficient validation and provisions an additional account; Proofpoint has not disclosed the affected parameter or code path. No authentication or user interaction is required, and the limited account can send trusted email to users in administrator-configured domains.

The record

CVE
CVE-2024-3676
Published
May 14, 2024
Updated
Aug 1, 2024
Vendor
Proofpoint
Product
Proofpoint Enterprise Protection
Classifications
CWE-20, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.18.6 <patch_4868
  2. Affected versionversion=8.18.6 <patch 4868 changes=[{"at":"patch 4868","status":"unaffected"}]
  3. Affected versionversion=8.20.0 <patch_4869
  4. Affected versionversion=8.20.0 <patch 4869 changes=[{"at":"patch 4869","status":"unaffected"}]
  5. Affected versionversion=8.20.2 <patch_4870
  6. Affected versionversion=8.20.2 <patch 4870 changes=[{"at":"patch 4870","status":"unaffected"}]
  7. Affected versionversion=8.20.4 <patch_4871
  8. Affected versionversion=8.20.4 <patch 4871 changes=[{"at":"patch 4871","status":"unaffected"}]
  9. Affected versionversion=8.21.0 <patch 4871 changes=[{"at":"patch 4872","status":"unaffected"}]
  10. Affected versionversion=8.21.0 <patch_4872

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Proofpoint · Proofpoint Enterprise Protectionversion=8.18.6 <patch_4868; version=8.18.6 <patch 4868 changes=[{"at":"patch 4868","status":"unaffected"}]; version=8.20.0 <patch_4869; version=8.20.0 <patch 4869 changes=[{"at":"patch 4869","status":"unaffected"}]; version=8.20.2 <patch_4870; version=8.20.2 <patch 4870 changes=[{"at":"patch 4870","status":"unaffected"}]; version=8.20.4 <patch_4871; version=8.20.4 <patch 4871 changes=[{"at":"patch 4871","status":"unaffected"}]; version=8.21.0 <patch 4871 changes=[{"at":"patch 4872","status":"unaffected"}]; version=8.21.0 <patch_4872

Published CVSS scores

7.5ProofpointCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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-20Improper Input Validation
T1136Create Account

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo