CVE-2021-27251

CVSS V2 High 8.3 CVSS V3 High 8.8
Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Authentication is not required to exploit this vulnerability The specific flaw exists within handling of firmware updates. The issue results from a fallback to a insecure protocol to deliver updates. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12308.
Overview
  • CVE ID
  • CVE-2021-27251
  • Assigner
  • zdi-disclosures@trendmicro.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-04-14T16:15:13
  • Last Modified Date
  • 2021-04-27T14:50:32
Weakness Enumerations
CWE URL
CWE-319 http://cwe.mitre.org/data/definitions/319.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:ex6100:v2:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex6150_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.98
cpe:2.3:h:netgear:ex6150:v2:*:*:*:*:*:*:* 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:ex6400:v2:*:*:*:*:*:*:* 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:ex7300:v2:*:*:*:*:*:*:* 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:C/I:C/A:C
  • Access Vector
  • ADJACENT_NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • COMPLETE
  • Integrity Impact
  • COMPLETE
  • Availability Impact
  • COMPLETE
  • Base Score
  • 8.3
  • Severity
  • HIGH
  • Exploitability Score
  • 6.5
  • Impact Score
  • 10
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • Attack Vector
  • ADJACENT_NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • HIGH
  • Availability Impact
  • HIGH
  • Base Score
  • 8.8
  • Base Severity
  • HIGH
  • Exploitability Score
  • 2.8
  • Impact Score
  • 5.9
References
Reference URL Reference Tags
https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders Patch Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-247/ Third Party Advisory VDB Entry
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-27251
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27251
History
Created Old Value New Value Data Type Notes
2022-05-10 07:14:04 Added to TrackCVE
2022-12-06 01:56:37 2021-04-14T16:15Z 2021-04-14T16:15:13 CVE Published Date updated
2022-12-06 01:56:37 2021-04-27T14:50:32 CVE Modified Date updated
2022-12-06 01:56:37 Analyzed Vulnerability Status updated