What is CVE-2022-45440?

CVE-2022-45440 is a medium-severity vulnerability in Zyxel Ax7501-B0, classified under Improper Link Resolution Before File Access. CVSS score: 4.4/10. Published 2023-01-17.

How severe is CVE-2022-45440?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Is CVE-2022-45440 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Zyxel Ax7501-B0

CVE-2022-45440

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.

EPSS: 0.002 (16.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

Affected products

Zyxel Ax7501-b0
Zyxel Ax7501-b0 Firmware — versions < V5.17(ABPC.3)C0
Zyxel Ax7501-b0_firmware

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

Public proof-of-concept exploits

References

security@zyxel.com.tw (Vendor Advisory)

Frequently asked questions

What is CVE-2022-45440?: CVE-2022-45440 is a medium-severity vulnerability in Zyxel Ax7501-B0, classified under Improper Link Resolution Before File Access. CVSS score: 4.4/10. Published 2023-01-17.
How severe is CVE-2022-45440?: Medium severity. CVSS v3 base score is 4.4 out of 10.
Is CVE-2022-45440 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.