CVE-2021-33213Public exploitNetwork attack vector

Authenticated internal-file retrieval via unchecked upload URL

Published Jul 14, 2021 · Updated Aug 3, 2024

Server-side request forgery in Element-IT HTTP Commander 5.3.3 allows remote authenticated users to retrieve files from internal HTTP and FTP servers. UploadFromURLHandler accepts a supplied URL without validating its destination, causing the server to request internal or loopback resources. Access requires authentication and an enabled Upload from URL feature; new installations disable it by default, and responses can disclose internal files or reveal open ports.

CVSS severity6.5
Medium
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Element-IT HTTP Commander 5.3.3 allows remote authenticated users to retrieve files from internal HTTP and FTP servers. UploadFromURLHandler accepts a supplied URL without validating its destination, causing the server to request internal or loopback resources. Access requires authentication and an enabled Upload from URL feature; new installations disable it by default, and responses can disclose internal files or reveal open ports.

The record

CVE
CVE-2021-33213
Published
Jul 14, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

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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