Medium severity · published Mar 5, 2021
CVE-2021-27257
This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of NETGEAR R7800 firmware version 1.0.2.76
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
This vulnerability allows network-adjacent attackers to compromise the integrity of downloaded information on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloading of files via FTP. The issue results from the lack of proper validation of the certificate presented by the server. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-12362.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 25% 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-2021-27257
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27257
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-21-264/
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CVE-2021-27256
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76
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CVE-2021-27255
This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76