Auth bypass in NETGEAR Ac2100
CVE-2020-27866
This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root. Was ZDI-CAN-11355.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.087 (94.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.087 · newest: 0.087 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- kb.netgear.com/000062641/Security-Advisory-for-Password-Recovery-Vulnerabilitie… (Vendor Advisory)
- www.zerodayinitiative.com/advisories/ZDI-20-1451/ (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27866?
- CVE-2020-27866 is a high-severity vulnerability in NETGEAR Ac2100, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 8.8/10. Published 2021-02-12.
- How severe is CVE-2020-27866?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-27866 known to be exploited?
- 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.