CVE-2025-66315
Published: 09 January 2026
Summary
CVE-2025-66315 is a medium-severity Improper Privilege Management (CWE-269) vulnerability in Zte Mf258K Pro Firmware. Its CVSS base score is 4.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Services File Permissions Weakness (T1574.010); ranked at the 12.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and AC-6 (Least Privilege).
Deeper analysis
CVE-2025-66315 is a configuration defect vulnerability in the version server of ZTE MF258K Pro products. The flaw arises from improper directory permission settings, enabling an attacker to execute write permissions in a specific directory. It carries a CVSS v3.1 base score of 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) and maps to CWE-269 and CWE-863.
A low-privileged user (PR:L) can exploit this vulnerability over the network (AV:N) with low attack complexity (AC:L) and no user interaction (UI:N). Exploitation allows write access to a specific directory in an unchanged scope (S:U), resulting in low impact to availability (A:L) with no effects on confidentiality or integrity.
Mitigation guidance is available in the ZTE security bulletin at https://support.zte.com.cn/zte-iccp-isupport-webui/bulletin/detail/4891644183717871638.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-1815
Vulnerability details
There is a configuration defect vulnerability in the version server of ZTE MF258K Pro products. Due to improper directory permission settings, an attacker can execute write permissions in a specific directory.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Improper directory permissions (CWE-269/863) directly constitute a file system permissions weakness allowing low-privileged network write access.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly enforces directory access permissions so that low-privileged users cannot obtain unauthorized write access to the version-server directory.
Requires assignment of only the minimum privileges needed, preventing the excessive write permissions that enable this vulnerability.
Mandates correct configuration of directory permissions on the ZTE device, directly eliminating the misconfiguration described in the CVE.