VDB-218468 · CVE-2022-45440 · EUVD-2022-48311

Zyxel AX7501-B0 prior 5.17(ABPC.3)C0 FTP Server file access

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.7	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in Zyxel AX7501-B0. This affects an unknown function of the component FTP Server. Such manipulation leads to file access. This vulnerability is listed as CVE-2022-45440. The attack must be carried out locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Zyxel AX7501-B0. Affected by this issue is an unknown code block of the component FTP Server. The manipulation with an unknown input leads to a file access vulnerability. Using CWE to declare the problem leads to CWE-552. The product makes files or directories accessible to unauthorized actors, even though they should not be. Impacted is confidentiality. CVE summarizes:

A vulnerability exists in the FTP server of the Zyxel AX7501-B0 firmware prior to V5.17(ABPC.3)C0, which processes symbolic links on external storage media. A local authenticated attacker with administrator privileges could abuse this vulnerability to access the root file system by creating a symbolic link on external storage media, such as a USB flash drive, and then logging into the FTP server on a vulnerable device.

The weakness was presented 01/17/2023. The advisory is shared for download at zyxel.com. This vulnerability is handled as CVE-2022-45440 since 11/15/2022. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1083.

Upgrading to version 5.17(ABPC.3)C0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2022-48311). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Zyxel

Name

AX7501-B0

License

commercial

Website

Vendor: https://www.zyxel.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 2.3
VulDB Temp Score: 2.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.4
NVD Vector: 🔍

CNA Base Score: 4.4
CNA Vector (Zyxel Corporation): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: File access
CWE: CWE-552 / CWE-425
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: AX7501-B0 5.17(ABPC.3)C0

Timelineinfo

11/15/2022 🔍
01/17/2023 +63 days 🔍
01/17/2023 +0 days 🔍
12/17/2025 +1065 days 🔍

Sourcesinfo

Vendor: zyxel.com

Advisory: zyxel.com
Status: Confirmed

CVE: CVE-2022-45440 (🔍)
GCVE (CVE): GCVE-0-2022-45440
GCVE (VulDB): GCVE-100-218468
EUVD: 🔍

Entryinfo

Created: 01/17/2023 08:02
Updated: 12/17/2025 12:51
Changes: 01/17/2023 08:02 (48), 02/09/2023 09:57 (1), 12/17/2025 11:04 (27), 12/17/2025 12:51 (1)
Complete: 🔍
Cache ID: 216::103