CVE-2021-44093Public exploitNetwork attack vector

Remote command execution via traversable avatar upload

Published Nov 28, 2021 · Updated Aug 4, 2024

Unrestricted file upload in ZrLog 2.2.2 allows remote attackers to execute commands by uploading a JSP web shell through avatar upload. The UploadController.generatorUri method derives a JSP extension from the supplied filename and concatenates the unchecked dir parameter into the storage path. No authentication or user interaction is required; path traversal places the JSP in an executable directory, and requesting it runs commands under the service account.

CVSS severity9.8
Critical
EPSS probability2.51%
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 ZrLog 2.2.2 allows remote attackers to execute commands by uploading a JSP web shell through avatar upload. The UploadController.generatorUri method derives a JSP extension from the supplied filename and concatenates the unchecked dir parameter into the storage path. No authentication or user interaction is required; path traversal places the JSP in an executable directory, and requesting it runs commands under the service account.

The record

CVE
CVE-2021-44093
Published
Nov 28, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 28, 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?

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

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell

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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