CVE-2021-28023Known exploitationPublic exploitNetwork attack vector

System-level code execution via ZIP path traversal

Published Nov 8, 2021 · Updated Aug 3, 2024

Arbitrary file upload in ServiceTonic Helpdesk before 9.0.35937 allows remote authenticated users to execute JSP code on the server. The Service import archive extractor accepts relative-path ZIP entries and writes a JSP web shell into a publicly reachable directory without confining extraction. Administrator access to the service-installation feature is required, and web-shell commands run with the system privileges held by the application.

CVSS severity9.8
Critical
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in ServiceTonic Helpdesk before 9.0.35937 allows remote authenticated users to execute JSP code on the server. The Service import archive extractor accepts relative-path ZIP entries and writes a JSP web shell into a publicly reachable directory without confining extraction. Administrator access to the service-installation feature is required, and web-shell commands run with the system privileges held by the application.

The record

CVE
CVE-2021-28023
Published
Nov 8, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 8, 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

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

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 exploitationReported
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.

Reported exploitation

Technologies

Your stack

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Your stack

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