CVE-2021-27257

CVSS V2 Low 3.3 CVSS V3 Medium 6.5
Description
This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloading of files via FTP. The issue results from the lack of proper validation of the certificate presented by the server. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-12362.
Overview
  • CVE ID
  • CVE-2021-27257
  • Assigner
  • zdi-disclosures@trendmicro.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-03-05T20:15:12
  • Last Modified Date
  • 2021-03-17T14:04:45
Weakness Enumerations
CWE URL
CWE-295 http://cwe.mitre.org/data/definitions/295.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:o:netgear:br200_firmware:*:*:*:*:*:*:*:* 1 OR 5.10.0.5
cpe:2.3:h:netgear:br200:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:br500_firmware:*:*:*:*:*:*:*:* 1 OR 5.10.0.5
cpe:2.3:h:netgear:br500:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:d7800_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.60
cpe:2.3:h:netgear:d7800:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex6100v2_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.98
cpe:2.3:h:netgear:ex6100v2:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex6150v2_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.98
cpe:2.3:h:netgear:ex6150v2:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex6250_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.134
cpe:2.3:h:netgear:ex6250:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex6400_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.2.158
cpe:2.3:h:netgear:ex6400:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex6400v2_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.134
cpe:2.3:h:netgear:ex6400v2:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex6410_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.134
cpe:2.3:h:netgear:ex6410:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex6420_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.134
cpe:2.3:h:netgear:ex6420:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex7300_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.2.158
cpe:2.3:h:netgear:ex7300:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex7300v2_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.134
cpe:2.3:h:netgear:ex7300v2:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex7320_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.134
cpe:2.3:h:netgear:ex7320:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex7700_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.216
cpe:2.3:h:netgear:ex7700:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex8000_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.232
cpe:2.3:h:netgear:ex8000:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:lbr20_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.3.50
cpe:2.3:h:netgear:lbr20:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.2.80
cpe:2.3:h:netgear:r7800:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r8900_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.5.28
cpe:2.3:h:netgear:r8900:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.5.28
cpe:2.3:h:netgear:r9000:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk12_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbk12:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk13_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbk13:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk14_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbk14:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk15_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbk15:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk20_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbk20:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk23_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbk23:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk40_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbk40:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk43_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbk43:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk43s_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbk43s:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk44_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbk44:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk50_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbk50:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbk53_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbk53:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbr10_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbr10:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbr20:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbr40:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbr50_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbr50:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbs10_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbs10:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbs20_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbs20:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbs40:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbs50_firmware:*:*:*:*:*:*:*:* 1 OR 2.7.2.104
cpe:2.3:h:netgear:rbs50:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbs50y_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.104
cpe:2.3:h:netgear:rbs50y:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:xr450_firmware:*:*:*:*:*:*:*:* 1 OR 2.3.2.114
cpe:2.3:h:netgear:xr450:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:xr500_firmware:*:*:*:*:*:*:*:* 1 OR 2.3.2.114
cpe:2.3:h:netgear:xr500:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:xr700_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.38
cpe:2.3:h:netgear:xr700:-:*:*:*:*:*:*:* 0 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:A/AC:L/Au:N/C:N/I:P/A:N
  • Access Vector
  • ADJACENT_NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • PARTIAL
  • Availability Impact
  • NONE
  • Base Score
  • 3.3
  • Severity
  • LOW
  • Exploitability Score
  • 6.5
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  • Attack Vector
  • ADJACENT_NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • NONE
  • Base Score
  • 6.5
  • Base Severity
  • MEDIUM
  • Exploitability Score
  • 2.8
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://www.zerodayinitiative.com/advisories/ZDI-21-264/ Third Party Advisory VDB Entry
https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders Patch Vendor Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-27257
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27257
History
Created Old Value New Value Data Type Notes
2022-05-10 07:19:38 Added to TrackCVE
2022-12-05 23:14:12 2021-03-05T20:15Z 2021-03-05T20:15:12 CVE Published Date updated
2022-12-05 23:14:12 2021-03-17T14:04:45 CVE Modified Date updated
2022-12-05 23:14:12 Analyzed Vulnerability Status updated