altervista flatnux 2021-03.25 unrestricted upload

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in altervista flatnux 2021-03.25 and classified as critical. Affected is an unknown function. The manipulation leads to unrestricted upload. This vulnerability is referenced as CVE-2023-53956. Remote exploitation of the attack is possible. Furthermore, an exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in altervista flatnux 2021-03.25. This issue affects an unknown part. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Flatnux 2021-03.25 contains an authenticated file upload vulnerability that allows administrative users to upload arbitrary PHP files through the file manager. Attackers with admin credentials can upload malicious PHP scripts to the web root directory, enabling remote code execution on the server.

The weakness was published by Ömer Hasan Durmuş as 51295. It is possible to read the advisory at exploit-db.com. The identification of this vulnerability is CVE-2023-53956 since 12/19/2025. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1608.002 according to MITRE ATT&CK.

The exploit is available at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (51295). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.2

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Unrestricted upload
CWE: CWE-434 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Exploit-DB: 🔒

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

12/19/2025 Advisory disclosed
12/19/2025 +0 days CVE reserved
12/19/2025 +0 days VulDB entry created
12/19/2025 +0 days VulDB entry last update

Sourcesinfo

Advisory: 51295
Researcher: Ömer Hasan Durmuş
Status: Not defined

CVE: CVE-2023-53956 (🔒)
GCVE (CVE): GCVE-0-2023-53956
GCVE (VulDB): GCVE-100-337655
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 12/19/2025 23:01
Changes: 12/19/2025 23:01 (79)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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