CVE-2021-36719Network attack vector

Authenticated code execution via unrestricted file upload

Published Dec 8, 2021 · Updated Aug 4, 2024

Unrestricted file upload in Cybonet PineApp Mail Secure allows remote authenticated users to execute code via nicUpload.php. The upload handler accepts a malicious file without restricting it to safe image types, allowing server-executable content to be stored and run. A valid PineApp user session is required, and successful exploitation permits arbitrary remote code execution and server takeover.

CVSS severity8.8
High
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Cybonet PineApp Mail Secure allows remote authenticated users to execute code via nicUpload.php. The upload handler accepts a malicious file without restricting it to safe image types, allowing server-executable content to be stored and run. A valid PineApp user session is required, and successful exploitation permits arbitrary remote code execution and server takeover.

The record

CVE
CVE-2021-36719
Published
Dec 8, 2021
Updated
Aug 4, 2024
Vendor
Cybonet
Product
PineApp Mail Secure
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=PineApp - Mail Secure Latest

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybonet · PineApp Mail Secureversion=PineApp - Mail Secure Latest

Published CVSS scores

9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

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

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Your stack

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