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TI-2020-16934 Aliases CVE-2020-27866GHSA-mj6p-ghhj-r3q4

Authentication bypass in NETGEAR Multiple Routers

Priority MEDIUM 49CWE-288Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-288.

Summary

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.

Why it matters now

EPSS 0.08656 95th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
NETGEARMultiple Routersfirmware version 1.2.0.62_1.0.1—No fix listedCNA
  • Multiple Routers VendorNETGEAR Affected firmware version 1.2.0.62_1.0.1 Fixed in — No fix listed CNA

CPE configurations NVD · 38

CPEVersionsRoleVendor
cpe:2.3:o:netgear:ac2100_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:ac2100:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:ac2400_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:ac2400:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:ac2600_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:ac2600:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6700_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:r6700:v2:*:*:*:*:*:*:*v2Running onNETGEAR
cpe:2.3:o:netgear:r6800_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:r6800:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
  • cpe:2.3:o:netgear:ac2100_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:ac2100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:ac2400_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:ac2400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:ac2600_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:ac2600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6700_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6700:v2:*:*:*:*:*:*:* Versions v2 Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6800_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
Show 28 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:netgear:r6900_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:r6900:v2:*:*:*:*:*:*:*v2Running onNETGEAR
cpe:2.3:o:netgear:r7200_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:r7200:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7350_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:r7350:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7400_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:r7400:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7450_firmware:*:*:*:*:*:*:*:*before 1.2.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:r7450:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6220_firmware:*:*:*:*:*:*:*:*before 1.1.0.104VulnerableNETGEAR
cpe:2.3:h:netgear:r6220:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6230_firmware:*:*:*:*:*:*:*:*before 1.1.0.104VulnerableNETGEAR
cpe:2.3:h:netgear:r6230:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6260_firmware:*:*:*:*:*:*:*:*before 1.1.0.78VulnerableNETGEAR
cpe:2.3:h:netgear:r6260:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6330_firmware:*:*:*:*:*:*:*:*before 1.1.0.78VulnerableNETGEAR
cpe:2.3:h:netgear:r6330:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6350_firmware:*:*:*:*:*:*:*:*before 1.1.0.78VulnerableNETGEAR
cpe:2.3:h:netgear:r6350:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6850_firmware:*:*:*:*:*:*:*:*before 1.1.0.78VulnerableNETGEAR
cpe:2.3:h:netgear:r6850:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6120_firmware:*:*:*:*:*:*:*:*before 1.0.0.76VulnerableNETGEAR
cpe:2.3:h:netgear:r6120:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6020_firmware:*:*:*:*:*:*:*:*before 1.0.0.48VulnerableNETGEAR
cpe:2.3:h:netgear:r6020:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6080_firmware:*:*:*:*:*:*:*:*before 1.0.0.48VulnerableNETGEAR
cpe:2.3:h:netgear:r6080:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
  • cpe:2.3:o:netgear:r6900_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6900:v2:*:*:*:*:*:*:* Versions v2 Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7200_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7350_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7350:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7400_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7450_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7450:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6220_firmware:*:*:*:*:*:*:*:* Versions before 1.1.0.104 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6220:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6230_firmware:*:*:*:*:*:*:*:* Versions before 1.1.0.104 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6230:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6260_firmware:*:*:*:*:*:*:*:* Versions before 1.1.0.78 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6260:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6330_firmware:*:*:*:*:*:*:*:* Versions before 1.1.0.78 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6330:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6350_firmware:*:*:*:*:*:*:*:* Versions before 1.1.0.78 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6350:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6850_firmware:*:*:*:*:*:*:*:* Versions before 1.1.0.78 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6850:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6120_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.76 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6120:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6020_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.48 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6020:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6080_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.48 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6080:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27866
  2. 2026-10-03 Alias added: GHSA-mj6p-ghhj-r3q4
  3. 2026-10-11 EPSS moved to the 95th–99th percentile

References

Advisory 2

  • TI-2021-20598 Certain NETGEAR devices are affected by authentication bypass. CVSS 3.1CRITICAL 9.8
  • TI-2021-16116 Certain NETGEAR devices are affected by lack of access control at the function level. CVSS 3.1CRITICAL 10.0
  • TI-2021-20724 Certain NETGEAR devices are affected by a stack-based buffer overflow by an… CVSS 3.1CRITICAL 9.8
  • TI-2021-09955 Certain NETGEAR devices are affected by a buffer overflow by an authenticated user. CVSS 3.1CRITICAL 9.9
  • TI-2021-20731 Certain NETGEAR devices are affected by incorrect configuration of security settings. CVSS 3.1CRITICAL 9.8
  • TI-2021-13855 Improper authentication in NETGEAR Multiple Routers CVSS 3.1HIGH 8.8
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences