CVE-2021-27257
NETGEAR R7800 FTP Certificate Validation Vulnerability (Remote Code Execution)
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.
INFO
Published Date :
March 5, 2021, 8:15 p.m.
Last Modified :
March 17, 2021, 2:04 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
2.8
Public PoC/Exploit Available at Github
CVE-2021-27257 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-27257
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-27257.
| URL | Resource |
|---|---|
| https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders | Patch Vendor Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-264/ | Third Party Advisory VDB Entry |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Repository that tracks public exploits, vulnerabilities and advisories that I [co-]discovered or [co-]authored.
Ruby Shell Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-27257 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-27257 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Mar. 17, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:A/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders No Types Assigned https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders Patch, Vendor Advisory Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-264/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-264/ Third Party Advisory, VDB Entry Added CPE Configuration AND OR *cpe:2.3:o:netgear:br200_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.10.0.5 OR cpe:2.3:h:netgear:br200:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:br500_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 5.10.0.5 OR cpe:2.3:h:netgear:br500:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:d7800_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.60 OR cpe:2.3:h:netgear:d7800:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6100v2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.98 OR cpe:2.3:h:netgear:ex6100v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6150v2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.98 OR cpe:2.3:h:netgear:ex6150v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6250_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.134 OR cpe:2.3:h:netgear:ex6250:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6400_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.2.158 OR cpe:2.3:h:netgear:ex6400:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6400v2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.134 OR cpe:2.3:h:netgear:ex6400v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6410_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.134 OR cpe:2.3:h:netgear:ex6410:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6420_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.134 OR cpe:2.3:h:netgear:ex6420:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex7300_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.2.158 OR cpe:2.3:h:netgear:ex7300:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex7300v2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.134 OR cpe:2.3:h:netgear:ex7300v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex7320_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.134 OR cpe:2.3:h:netgear:ex7320:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex7700_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.216 OR cpe:2.3:h:netgear:ex7700:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex8000_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.232 OR cpe:2.3:h:netgear:ex8000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:lbr20_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.3.50 OR cpe:2.3:h:netgear:lbr20:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.2.80 OR cpe:2.3:h:netgear:r7800:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r8900_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.5.28 OR cpe:2.3:h:netgear:r8900:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.5.28 OR cpe:2.3:h:netgear:r9000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk12_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbk12:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk13_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbk13:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk14_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbk14:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk15_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbk15:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk20_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbk20:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk23_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbk23:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk40_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbk40:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk43_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbk43:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk43s_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbk43s:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk44_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbk44:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk50_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbk50:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbk53_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbk53:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbr10_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbr10:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbr20:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbr40:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbr50_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbr50:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs10_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbs10:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs20_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbs20:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbs40:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs50_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.2.104 OR cpe:2.3:h:netgear:rbs50:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs50y_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.2.104 OR cpe:2.3:h:netgear:rbs50y:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:xr450_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.3.2.114 OR cpe:2.3:h:netgear:xr450:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:xr500_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.3.2.114 OR cpe:2.3:h:netgear:xr500:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:xr700_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.38 OR cpe:2.3:h:netgear:xr700:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Mar. 05, 2021
Action Type Old Value New Value Changed 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. 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.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-27257 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-27257
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.13 }} -0.02%
score
0.46853
percentile