CVE-2021-27239

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 R6400 and R6700 firmware version 1.0.4.98 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the upnpd service, which listens on UDP port 1900 by default. A crafted MX header field in an SSDP message can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11851.
Overview
  • CVE ID
  • CVE-2021-27239
  • Assigner
  • zdi-disclosures@trendmicro.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-03-29T21:15:12
  • Last Modified Date
  • 2021-04-02T14:03:08
Weakness Enumerations
CWE URL
CWE-121 http://cwe.mitre.org/data/definitions/121.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:o:netgear:d6220_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.68
cpe:2.3:h:netgear:d6220:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:d6400_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.102
cpe:2.3:h:netgear:d6400:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:d7000_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.66
cpe:2.3:h:netgear:d7000:v2:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:d8500_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.3.60
cpe:2.3:h:netgear:d8500:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:dc112a_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.54
cpe:2.3:h:netgear:dc112a:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex7000_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.94
cpe:2.3:h:netgear:ex7000:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:ex7500_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.72
cpe:2.3:h:netgear:ex7500:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r6250_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.4.48
cpe:2.3:h:netgear:r6250:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r6300_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.4.50
cpe:2.3:h:netgear:r6300:v2:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r6400_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.68
cpe:2.3:h:netgear:r6400:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r6400_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.4.102
cpe:2.3:h:netgear:r6400:v2:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r6700_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.4.102
cpe:2.3:h:netgear:r6700:v3:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r6900p_firmware:*:*:*:*:*:*:*:* 1 OR 1.3.2.132
cpe:2.3:h:netgear:r6900p:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r7000_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.11.116
cpe:2.3:h:netgear:r7000:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r7000p_firmware:*:*:*:*:*:*:*:* 1 OR 1.3.2.132
cpe:2.3:h:netgear:r7000p:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r7100lg_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.0.64
cpe:2.3:h:netgear:r7100lg:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r7850_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.5.68
cpe:2.3:h:netgear:r7850:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r7900_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.4.38
cpe:2.3:h:netgear:r7900:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r7900p_firmware:*:*:*:*:*:*:*:* 1 OR 1.4.1.68
cpe:2.3:h:netgear:r7900p:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r7960p_firmware:*:*:*:*:*:*:*:* 1 OR 1.4.1.68
cpe:2.3:h:netgear:r7960p:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r8000_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.4.68
cpe:2.3:h:netgear:r8000:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r8000p_firmware:*:*:*:*:*:*:*:* 1 OR 1.4.1.68
cpe:2.3:h:netgear:r8000p:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r8300_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.2.144
cpe:2.3:h:netgear:r8300:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:r8500_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.2.144
cpe:2.3:h:netgear:r8500:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rax200_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.2.88
cpe:2.3:h:netgear:rax200:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rax75_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.3.102
cpe:2.3:h:netgear:rax75:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rax80_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.3.102
cpe:2.3:h:netgear:rax80:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbr750_firmware:*:*:*:*:*:*:*:* 1 OR 3.2.17.12
cpe:2.3:h:netgear:rbr750:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbr850_firmware:*:*:*:*:*:*:*:* 1 OR 3.2.17.12
cpe:2.3:h:netgear:rbr850:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbs40v_firmware:*:*:*:*:*:*:*:* 1 OR 2.6.2.4
cpe:2.3:h:netgear:rbs40v:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbs750_firmware:*:*:*:*:*:*:*:* 1 OR 3.2.17.12
cpe:2.3:h:netgear:rbs750:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rbs850_firmware:*:*:*:*:*:*:*:* 1 OR 3.2.17.12
cpe:2.3:h:netgear:rbs850:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:rs400_firmware:*:*:*:*:*:*:*:* 1 OR 1.5.0.68
cpe:2.3:h:netgear:rs400:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:wndr3400_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.1.38
cpe:2.3:h:netgear:wndr3400:v3:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:wnr3500l_firmware:*:*:*:*:*:*:*:* 1 OR 1.2.0.66
cpe:2.3:h:netgear:wnr3500l:v2:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:netgear:xr300_firmware:*:*:*:*:*:*:*:* 1 OR 1.0.3.56
cpe:2.3:h:netgear:xr300:-:*:*:*:*:*:*:* 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/000062820/Security-Advisory-for-Stack-based-Buffer-Overflow-Remote-Code-Execution-Vulnerability-on-Some-Routers-PSV-2020-0432 Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-206/ Third Party Advisory VDB Entry
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-27239
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27239
History
Created Old Value New Value Data Type Notes
2022-05-10 07:17:25 Added to TrackCVE
2022-12-06 00:36:28 2021-03-29T21:15Z 2021-03-29T21:15:12 CVE Published Date updated
2022-12-06 00:36:28 2021-04-02T14:03:08 CVE Modified Date updated
2022-12-06 00:36:28 Analyzed Vulnerability Status updated