High severity · published Mar 5, 2021
CVE-2021-27254
This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.
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)0.5% · higher than 44% 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
Ex6150v2 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-2021-27254
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27254
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-21-252/
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