High severity · published Apr 14, 2021
CVE-2021-27253
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800
8.8
CVSS
1.1%
EPSS
No
On KEV
Description
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. Was ZDI-CAN-12303.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BF
Br200 Firmware · Netgear
before 5.10.0.5 · source: NVD
BF
Br500 Firmware · Netgear
before 5.10.0.5 · source: NVD
DF
D7800 Firmware · Netgear
before 1.0.1.60 · source: NVD
EF
Ex6100v2 Firmware · Netgear
before 1.0.1.98 · source: NVD
EF
Ex6150 Firmware · Netgear
before 1.0.1.98 · source: NVD
EF
Ex6250 Firmware · Netgear
before 1.0.0.134 · source: NVD
EF
Ex6400 Firmware · Netgear
before 1.0.2.158 · source: NVD
EF
Ex6400v2 Firmware · Netgear
before 1.0.0.134 · source: NVD
EF
Ex6410 Firmware · Netgear
before 1.0.0.134 · source: NVD
EF
Ex6420 Firmware · Netgear
before 1.0.0.134 · source: NVD
EF
Ex7300 Firmware · Netgear
before 1.0.2.158 · source: NVD
EF
Ex7300v2 Firmware · Netgear
before 1.0.0.134 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27253
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27253
Patch
https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-249/
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