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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
8.8 HIGH
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
zdiCNA
8.8 HIGH
ADJACENT_NETWORK
LOW
NONE
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 82%
VendorProductVersion
netgeard6220_firmware
𝑥
< 1.0.0.68
netgeard6400_firmware
𝑥
< 1.0.0.102
netgeard7000_firmware
𝑥
< 1.0.0.66
netgeard8500_firmware
𝑥
< 1.0.3.60
netgeardc112a_firmware
𝑥
< 1.0.0.54
netgearex7000_firmware
𝑥
< 1.0.1.94
netgearex7500_firmware
𝑥
< 1.0.0.72
netgearr6250_firmware
𝑥
< 1.0.4.48
netgearr6300_firmware
𝑥
< 1.0.4.50
netgearr6400_firmware
𝑥
< 1.0.1.68
netgearr6400_firmware
𝑥
< 1.0.4.102
netgearr6700_firmware
𝑥
< 1.0.4.102
netgearr6900p_firmware
𝑥
< 1.3.2.132
netgearr7000_firmware
𝑥
< 1.0.11.116
netgearr7000p_firmware
𝑥
< 1.3.2.132
netgearr7100lg_firmware
𝑥
< 1.0.0.64
netgearr7850_firmware
𝑥
< 1.0.5.68
netgearr7900_firmware
𝑥
< 1.0.4.38
netgearr7900p_firmware
𝑥
< 1.4.1.68
netgearr7960p_firmware
𝑥
< 1.4.1.68
netgearr8000_firmware
𝑥
< 1.0.4.68
netgearr8000p_firmware
𝑥
< 1.4.1.68
netgearr8300_firmware
𝑥
< 1.0.2.144
netgearr8500_firmware
𝑥
< 1.0.2.144
netgearrax200_firmware
𝑥
< 1.0.2.88
netgearrax75_firmware
𝑥
< 1.0.3.102
netgearrax80_firmware
𝑥
< 1.0.3.102
netgearrbr750_firmware
𝑥
< 3.2.17.12
netgearrbr850_firmware
𝑥
< 3.2.17.12
netgearrbs40v_firmware
𝑥
< 2.6.2.4
netgearrbs750_firmware
𝑥
< 3.2.17.12
netgearrbs850_firmware
𝑥
< 3.2.17.12
netgearrs400_firmware
𝑥
≤ 1.5.0.68
netgearwndr3400_firmware
𝑥
< 1.0.1.38
netgearwnr3500l_firmware
𝑥
< 1.2.0.66
netgearxr300_firmware
𝑥
< 1.0.3.56
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://kb.netgear.com/000062820/Security-Advisory-for-Stack-based-Buffer-Overflow-Remote-Code-Execution-Vulnerability-on-Some-Routers-PSV-2020-0432
https://www.zerodayinitiative.com/advisories/ZDI-21-206/
https://kb.netgear.com/000062820/Security-Advisory-for-Stack-based-Buffer-Overflow-Remote-Code-Execution-Vulnerability-on-Some-Routers-PSV-2020-0432
https://www.zerodayinitiative.com/advisories/ZDI-21-206/