CVE-2020-23043Public exploitNetwork attack vector

Code execution via unchecked multiple file extensions

Published Oct 22, 2021 · Updated Aug 4, 2024

Arbitrary file upload in Tran Tu Air Sender 1.0.2 allows remote authenticated users to execute code through its local transfer web server. The upload module accepts a crafted POST request with a malicious filen value because it does not reject multiple file extensions. The technical advisory inconsistently labels access as both pre-authentication and requiring a low-privilege FTP application account; no user interaction is required.

CVSS severity8.8
High
EPSS probability1.71%
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 Tran Tu Air Sender 1.0.2 allows remote authenticated users to execute code through its local transfer web server. The upload module accepts a crafted POST request with a malicious filen value because it does not reject multiple file extensions. The technical advisory inconsistently labels access as both pre-authentication and requiring a low-privilege FTP application account; no user interaction is required.

The record

CVE
CVE-2020-23043
Published
Oct 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
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 exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1105Ingress Tool Transfer

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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