Security readout for executives and security teams
Plain-English summary
CVE-2022-45440 affects Zyxel AX7501-B0 firmware before V5.17(ABPC.3)C0. An administrator with local access can use external storage and the device FTP server to read the root file system. This is not a remote unauthenticated issue, but it can expose sensitive device files if administrator access is misused.
Executive priority
Prioritize remediation for managed AX7501-B0 devices, especially in customer or shared-admin environments. The issue has limited preconditions but can disclose sensitive system files once abused.
Technical view
The issue is CWE-59 improper symbolic link handling in the AX7501-B0 FTP server. A local authenticated attacker with administrator privileges can place a symbolic link on external storage, then access the root file system through FTP. CVSS v3.1 is 4.4: AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.
Likely exposure
Exposure appears limited to Zyxel AX7501-B0 CPE devices running firmware earlier than V5.17(ABPC.3)C0, where an administrator can use external storage and FTP. Other products are not identified in the provided sources.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not listed as KEV. Exploitation requires local access and administrator privileges, so practical risk is highest where admin credentials or device access are shared, weakly controlled, or compromised.
Researcher notes
Evidence supports a local, high-privilege confidentiality issue only. The source bundle names one affected product and fixed firmware threshold. No exploit activity, public proof-of-concept, or broader product impact is established in the provided material.
Mitigation direction
- Upgrade AX7501-B0 firmware to V5.17(ABPC.3)C0 or later per Zyxel guidance.
- Confirm administrator access is limited to trusted personnel only.
- Review Zyxel’s advisory for any model-specific operational workaround.
- Treat unexpected administrator access as a possible exposure path.
Validation and detection
- Inventory AX7501-B0 devices and record installed firmware versions.
- Flag any device running firmware earlier than V5.17(ABPC.3)C0.
- Confirm FTP and external storage use match approved operational requirements.
- Review administrator account ownership and recent access history.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-59: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-45440 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N0.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.4MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.