Auth bypass in Zyxel P-870h-51
CVE-2018-1164
This vulnerability allows remote attackers to cause a denial-of-service condition on vulnerable installations of ZyXEL P-870H-51 DSL Router 1.00(AWG.3)D5. Authentication is not required to exploit this vulnerability. The specific flaw exists within numerous exposed CGI endpoints. The vulnerability is caused by improper access controls that allow access to critical functions without authentication. An attacker can use this vulnerability to reboot affected devices, along with other actions. Was ZDI-CAN-4540.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.040 (90.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.040 · newest: 0.040 · change: 0.000
Affected products
- Zyxel P-870h-51
- Zyxel P-870h-51 Firmware — versions 1.00\(awg.3\)d5, 1.00(awg.3)d5
- Zyxel P-870h-51 Dsl Router — versions 1.00(AWG.3)D5
Weakness classification (CWE)
References
- zerodayinitiative.com/advisories/ZDI-18-135 (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-1164?
- CVE-2018-1164 is a critical-severity vulnerability in Zyxel P-870h-51, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2018-02-21.
- How severe is CVE-2018-1164?
- Critical severity. CVSS v3 base score is 9.8 out of 10.