CVE-2021-43970Network attack vector

Authenticated RCE via albumimages.jsp upload

Published Mar 7, 2022 · Updated Aug 4, 2024

Arbitrary file upload in Quicklert for Digium 10.0.0 allows remote authenticated users to execute code via albumimages.jsp. The albumimages.jsp audioFile parameter accepts a filename containing .mp3;.jsp when the file begins with audio bytes, then serves the uploaded JSP for execution. A low-privileged authenticated account is required; execution occurs with the application's SYSTEM-level permissions and can compromise confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability1.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Quicklert for Digium 10.0.0 allows remote authenticated users to execute code via albumimages.jsp. The albumimages.jsp audioFile parameter accepts a filename containing .mp3;.jsp when the file begins with audio bytes, then serves the uploaded JSP for execution. A low-privileged authenticated account is required; execution occurs with the application's SYSTEM-level permissions and can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2021-43970
Published
Mar 7, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2022CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0NVDAV:N/AC:L/Au:S/C:C/I:C/A:C

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
T1505.003Server Software Component: Web Shell
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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