Vulnerability Monitor

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CVE-2021-27239

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.8, indicating it requires adjacent network access with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 70 products from netgear, from netgear, from netgear and 67 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-03-29T21:15:12.377

Last Modified

2024-11-21T05:57:39.813

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.8 (HIGH)

CVSSv2 Vector

AV:A/AC:L/Au:N/C:C/I:C/A:C

  • Access Vector: ADJACENT_NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

6.5

Impact Score

10.0

Weaknesses
  • Type: Secondary
    CWE-121
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System netgear d6220_firmware < 1.0.0.68 Yes
Hardware netgear d6220 - No
Operating System netgear d6400_firmware < 1.0.0.102 Yes
Hardware netgear d6400 - No
Operating System netgear d7000_firmware < 1.0.0.66 Yes
Hardware netgear d7000 v2 No
Operating System netgear d8500_firmware < 1.0.3.60 Yes
Hardware netgear d8500 - No
Operating System netgear dc112a_firmware < 1.0.0.54 Yes
Hardware netgear dc112a - No
Operating System netgear ex7000_firmware < 1.0.1.94 Yes
Hardware netgear ex7000 - No
Operating System netgear ex7500_firmware < 1.0.0.72 Yes
Hardware netgear ex7500 - No
Operating System netgear r6250_firmware < 1.0.4.48 Yes
Hardware netgear r6250 - No
Operating System netgear r6300_firmware < 1.0.4.50 Yes
Hardware netgear r6300 v2 No
Operating System netgear r6400_firmware < 1.0.1.68 Yes
Hardware netgear r6400 - No
Operating System netgear r6400_firmware < 1.0.4.102 Yes
Hardware netgear r6400 v2 No
Operating System netgear r6700_firmware < 1.0.4.102 Yes
Hardware netgear r6700 v3 No
Operating System netgear r6900p_firmware < 1.3.2.132 Yes
Hardware netgear r6900p - No
Operating System netgear r7000_firmware < 1.0.11.116 Yes
Hardware netgear r7000 - No
Operating System netgear r7000p_firmware < 1.3.2.132 Yes
Hardware netgear r7000p - No
Operating System netgear r7100lg_firmware < 1.0.0.64 Yes
Hardware netgear r7100lg - No
Operating System netgear r7850_firmware < 1.0.5.68 Yes
Hardware netgear r7850 - No
Operating System netgear r7900_firmware < 1.0.4.38 Yes
Hardware netgear r7900 - No
Operating System netgear r7900p_firmware < 1.4.1.68 Yes
Hardware netgear r7900p - No
Operating System netgear r7960p_firmware < 1.4.1.68 Yes
Hardware netgear r7960p - No
Operating System netgear r8000_firmware < 1.0.4.68 Yes
Hardware netgear r8000 - No
Operating System netgear r8000p_firmware < 1.4.1.68 Yes
Hardware netgear r8000p - No
Operating System netgear r8300_firmware < 1.0.2.144 Yes
Hardware netgear r8300 - No
Operating System netgear r8500_firmware < 1.0.2.144 Yes
Hardware netgear r8500 - No
Operating System netgear rax200_firmware < 1.0.2.88 Yes
Hardware netgear rax200 - No
Operating System netgear rax75_firmware < 1.0.3.102 Yes
Hardware netgear rax75 - No
Operating System netgear rax80_firmware < 1.0.3.102 Yes
Hardware netgear rax80 - No
Operating System netgear rbr750_firmware < 3.2.17.12 Yes
Hardware netgear rbr750 - No
Operating System netgear rbr850_firmware < 3.2.17.12 Yes
Hardware netgear rbr850 - No
Operating System netgear rbs40v_firmware < 2.6.2.4 Yes
Hardware netgear rbs40v - No
Operating System netgear rbs750_firmware < 3.2.17.12 Yes
Hardware netgear rbs750 - No
Operating System netgear rbs850_firmware < 3.2.17.12 Yes
Hardware netgear rbs850 - No
Operating System netgear rs400_firmware ≤ 1.5.0.68 Yes
Hardware netgear rs400 - No
Operating System netgear wndr3400_firmware < 1.0.1.38 Yes
Hardware netgear wndr3400 v3 No
Operating System netgear wnr3500l_firmware < 1.2.0.66 Yes
Hardware netgear wnr3500l v2 No
Operating System netgear xr300_firmware < 1.0.3.56 Yes
Hardware netgear xr300 - No
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For netgear's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.