high
8.8
CWE
787 122
Advisory Published
Updated
Advisory Published

CVE-2021-27253: (Pwn2Own) NETGEAR Nighthawk R7800 Heap-based Buffer Overflow Remote Code Execution Vulnerability

First published: Wed Apr 14 2021(Updated: )

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_bind.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root.

Credit: zdi-disclosures@trendmicro.com

Affected SoftwareAffected VersionHow to fix
NETGEAR R7800
NETGEAR br200<5.10.0.5
NETGEAR BR200 Firmware
NETGEAR br500 firmware<5.10.0.5
NETGEAR br500 firmware
NETGEAR D7800<1.0.1.60
NETGEAR D7800 Firmware
NETGEAR EX6100v2 firmware<1.0.1.98
Netgear EX6100=v2
NETGEAR EX6150<1.0.1.98
NETGEAR EX6150v2=v2
NETGEAR EX6250<1.0.0.134
NETGEAR EX6250
NETGEAR EX6400 firmware<1.0.2.158
NETGEAR EX6400v2
NETGEAR EX6400v2 firmware<1.0.0.134
NETGEAR EX6400v2=v2
NETGEAR EX6410<1.0.0.134
NETGEAR EX6410
NETGEAR EX6420<1.0.0.134
NETGEAR EX6420
NETGEAR EX7300<1.0.2.158
NETGEAR EX7300v2
NETGEAR EX7300v2 firmware<1.0.0.134
NETGEAR EX7300v2=v2
NETGEAR EX7320<1.0.0.134
NETGEAR EX7320
NETGEAR EX7700<1.0.0.216
NETGEAR EX7700
NETGEAR EX8000<1.0.1.232
NETGEAR EX8000
NETGEAR LBR20 firmware<2.6.3.50
NETGEAR LBR20 firmware
NETGEAR R7800 firmware<1.0.2.80
NETGEAR R7800
NETGEAR R8900 firmware<1.0.5.28
NETGEAR R8900
NETGEAR R9000 firmware<1.0.5.28
NETGEAR R9000 firmware
NETGEAR RBK12 firmware<2.7.2.104
NETGEAR RBK12 firmware
NETGEAR rbk13 firmware<2.7.2.104
NETGEAR rbk13 firmware
NETGEAR rbk14 firmware<2.7.2.104
NETGEAR rbk14 firmware
NETGEAR RBK15 Firmware<2.7.2.104
NETGEAR RBK15 Firmware
NETGEAR RBK20 Router Firmware<2.6.2.104
NETGEAR RBK20 firmware
NETGEAR RBK23 Satellite Firmware<2.7.2.104
NETGEAR Orbi RBK23
NETGEAR RBK40<2.6.2.104
NETGEAR RBK40 firmware
NETGEAR RBK43<2.6.2.104
NETGEAR RBK43 Router Firmware
NETGEAR RBK43S Router Firmware<2.6.2.104
NETGEAR RBK43S Firmware
NETGEAR RBK44 Satellite Firmware<2.6.2.104
NETGEAR RBK44 Satellite Firmware
NETGEAR RBK50 firmware<2.7.2.104
NETGEAR RBK50
NETGEAR RBK53 Firmware<2.7.2.104
NETGEAR Orbi RBK53
NETGEAR RBR10 firmware<2.6.2.104
NETGEAR RBR10 firmware
NETGEAR RBR20<2.6.2.104
NETGEAR RBR20
NETGEAR CBR40 firmware<2.6.2.104
NETGEAR RBR40 firmware
NETGEAR RBR50 firmware<2.7.2.104
NETGEAR RBR50 firmware
NETGEAR RBS10<2.6.2.104
NETGEAR RBS10 firmware
NETGEAR RBS20 firmware<2.6.2.104
NETGEAR RBS20 firmware
NETGEAR RBS40 firmware<2.6.2.104
NETGEAR RBS40 firmware
NETGEAR RBS50 firmware<2.7.2.104
NETGEAR RBS50
NETGEAR RBS50Y firmware<2.6.2.104
NETGEAR RBS50Y firmware
NETGEAR XR450 firmware<2.3.2.114
NETGEAR XR450 firmware
NETGEAR XR500 firmware<2.3.2.114
NETGEAR XR500 firmware
NETGEAR XR700<1.0.1.38
NETGEAR XR700 firmware

Remedy

https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-27253?

    CVE-2021-27253 has a severity rating that suggests it allows network-adjacent attackers to execute arbitrary code on vulnerable NETGEAR devices.

  • How do I fix CVE-2021-27253?

    To fix CVE-2021-27253, it is recommended to update the firmware of affected NETGEAR devices to the latest version provided by the vendor.

  • Which NETGEAR devices are affected by CVE-2021-27253?

    Affected NETGEAR devices include the Nighthawk R7800, among several other models listed in the advisory.

  • Can CVE-2021-27253 be exploited without authentication?

    Although authentication is generally required, the flaw in CVE-2021-27253 can allow attackers to bypass this authentication.

  • What type of vulnerability is CVE-2021-27253?

    CVE-2021-27253 is classified as a remote code execution vulnerability that impacts certain NETGEAR routers.

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