Vulnerability Name:

CVE-2020-27866 (CCN-193435)

Assigned:2020-12-16
Published:2020-12-16
Updated:2021-03-26
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.
CVSS v3 Severity:8.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.7 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.7 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:8.3 High (CVSS v2 Vector: AV:A/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
8.3 High (CCN CVSS v2 Vector: AV:A/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-288
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2020-27866

Source: XF
Type: UNKNOWN
netgear-cve202027866-code-exec(193435)

Source: CCN
Type: NETGEAR Security Advisory: 000062641
Security Advisory for Password Recovery Vulnerabilities on Some Routers

Source: MISC
Type: Vendor Advisory
https://kb.netgear.com/000062641/Security-Advisory-for-Password-Recovery-Vulnerabilities-on-Some-Routers

Source: CCN
Type: ZDI-20-1451
NETGEAR Multiple Routers mini_httpd Authentication Bypass Vulnerability

Source: MISC
Type: Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-20-1451/

Vulnerable Configuration:Configuration 1:
  • cpe:/o:netgear:ac2100_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:ac2100:-:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:netgear:ac2400_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:ac2400:-:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:netgear:ac2600_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:ac2600:-:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/o:netgear:r6700_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:r6700:v2:*:*:*:*:*:*:*

    • Configuration 5:
  • cpe:/o:netgear:r6800_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:r6800:-:*:*:*:*:*:*:*

    • Configuration 6:
  • cpe:/o:netgear:r6900_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:r6900:v2:*:*:*:*:*:*:*

    • Configuration 7:
  • cpe:/o:netgear:r7200_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:r7200:-:*:*:*:*:*:*:*

    • Configuration 8:
  • cpe:/o:netgear:r7350_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:r7350:-:*:*:*:*:*:*:*

    • Configuration 9:
  • cpe:/o:netgear:r7400_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:r7400:-:*:*:*:*:*:*:*

    • Configuration 10:
  • cpe:/o:netgear:r7450_firmware:*:*:*:*:*:*:*:* (Version < 1.2.0.76)
  • AND
  • cpe:/h:netgear:r7450:-:*:*:*:*:*:*:*

    • Configuration 11:
  • cpe:/o:netgear:r6220_firmware:*:*:*:*:*:*:*:* (Version < 1.1.0.104)
  • AND
  • cpe:/h:netgear:r6220:-:*:*:*:*:*:*:*

    • Configuration 12:
  • cpe:/o:netgear:r6230_firmware:*:*:*:*:*:*:*:* (Version < 1.1.0.104)
  • AND
  • cpe:/h:netgear:r6230:-:*:*:*:*:*:*:*

    • Configuration 13:
  • cpe:/o:netgear:r6260_firmware:*:*:*:*:*:*:*:* (Version < 1.1.0.78)
  • AND
  • cpe:/h:netgear:r6260:-:*:*:*:*:*:*:*

    • Configuration 14:
  • cpe:/o:netgear:r6330_firmware:*:*:*:*:*:*:*:* (Version < 1.1.0.78)
  • AND
  • cpe:/h:netgear:r6330:-:*:*:*:*:*:*:*

    • Configuration 15:
  • cpe:/o:netgear:r6350_firmware:*:*:*:*:*:*:*:* (Version < 1.1.0.78)
  • AND
  • cpe:/h:netgear:r6350:-:*:*:*:*:*:*:*

    • Configuration 16:
  • cpe:/o:netgear:r6850_firmware:*:*:*:*:*:*:*:* (Version < 1.1.0.78)
  • AND
  • cpe:/h:netgear:r6850:-:*:*:*:*:*:*:*

    • Configuration 17:
  • cpe:/o:netgear:r6120_firmware:*:*:*:*:*:*:*:* (Version < 1.0.0.76)
  • AND
  • cpe:/h:netgear:r6120:-:*:*:*:*:*:*:*

    • Configuration 18:
  • cpe:/o:netgear:r6020_firmware:*:*:*:*:*:*:*:* (Version < 1.0.0.48)
  • AND
  • cpe:/h:netgear:r6020:-:*:*:*:*:*:*:*

    • Configuration 19:
  • cpe:/o:netgear:r6080_firmware:*:*:*:*:*:*:*:* (Version < 1.0.0.48)
  • AND
  • cpe:/h:netgear:r6080:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/h:netgear:r6220:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r6350:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r6800:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r6850:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r6260:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r6700:v2:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r6900:v2:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:ac2100:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:ac2400:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:ac2600:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r7450:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r6230:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r7200:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r7350:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r7400:-:*:*:*:*:*:*:*
  • OR cpe:/h:netgear:r6330:-:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    netgear ac2100 firmware *
    netgear ac2100 -
    netgear ac2400 firmware *
    netgear ac2400 -
    netgear ac2600 firmware *
    netgear ac2600 -
    netgear r6700 firmware *
    netgear r6700 v2
    netgear r6800 firmware *
    netgear r6800 -
    netgear r6900 firmware *
    netgear r6900 v2
    netgear r7200 firmware *
    netgear r7200 -
    netgear r7350 firmware *
    netgear r7350 -
    netgear r7400 firmware *
    netgear r7400 -
    netgear r7450 firmware *
    netgear r7450 -
    netgear r6220 firmware *
    netgear r6220 -
    netgear r6230 firmware *
    netgear r6230 -
    netgear r6260 firmware *
    netgear r6260 -
    netgear r6330 firmware *
    netgear r6330 -
    netgear r6350 firmware *
    netgear r6350 -
    netgear r6850 firmware *
    netgear r6850 -
    netgear r6120 firmware *
    netgear r6120 -
    netgear r6020 firmware *
    netgear r6020 -
    netgear r6080 firmware *
    netgear r6080 -
    netgear r6220 -
    netgear r6350 -
    netgear r6800 -
    netgear r6850 -
    netgear r6260 -
    netgear r6700 v2
    netgear r6900 v2
    netgear ac2100 -
    netgear ac2400 -
    netgear ac2600 -
    netgear r7450 -
    netgear r6230 -
    netgear r7200 -
    netgear r7350 -
    netgear r7400 -
    netgear r6330 -