CVE-2021-34947
NETGEAR R7800 Out-Of-Bounds Write Remote Code Execution
Description
NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of the soap_block_table file. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of root. . Was ZDI-CAN-13055.
INFO
Published Date :
May 7, 2024, 11:15 p.m.
Last Modified :
Aug. 14, 2025, 1:42 a.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2021-34947
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.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.0 | HIGH | [email protected] |
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-2021-34947.
| URL | Resource |
|---|---|
| https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129 | Third Party Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-1116/ | Third Party Advisory |
| https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129 | Third Party Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-1116/ | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-34947 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-2021-34947
weaknesses.
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-34947 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-34947 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.
-
Initial Analysis by [email protected]
Aug. 14, 2025
Action Type Old Value New Value Added CPE Configuration AND OR *cpe:2.3:o:netgear:d7800_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.64 OR cpe:2.3:h:netgear:d7800:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex2700_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.66 OR cpe:2.3:h:netgear:ex2700:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6100_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.106 OR cpe:2.3:h:netgear:ex6100:v2:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6150_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.106 OR cpe:2.3:h:netgear:ex6150:v2:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6200_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.86 OR cpe:2.3:h:netgear:ex6200:v2:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6250_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.146 OR cpe:2.3:h:netgear:ex6250:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6400_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.2.164 OR cpe:2.3:h:netgear:ex6400:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6400v2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.146 OR cpe:2.3:h:netgear:ex6400v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6410_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.146 OR cpe:2.3:h:netgear:ex6410:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6420_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.146 OR cpe:2.3:h:netgear:ex6420:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex6500v1_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.146 OR cpe:2.3:h:netgear:ex6500v1:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex7300_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.2.164 OR cpe:2.3:h:netgear:ex7300:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex7300v2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.146 OR cpe:2.3:h:netgear:ex7300v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex7320_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.146 OR cpe:2.3:h:netgear:ex7320:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex7700_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.222 OR cpe:2.3:h:netgear:ex7700:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:ex8000_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.238 OR cpe:2.3:h:netgear:ex8000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:lbr1020_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.5.32 OR cpe:2.3:h:netgear:lbr1020:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:lbr20_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.6.5.32 OR cpe:2.3:h:netgear:lbr20:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r6700ax_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.5.108 OR cpe:2.3:h:netgear:r6700ax:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.2.84 OR cpe:2.3:h:netgear:r7800:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r8900_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.5.36 OR cpe:2.3:h:netgear:r8900:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.5.36 OR cpe:2.3:h:netgear:r9000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rax10_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.5.108 OR cpe:2.3:h:netgear:rax10:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rax120_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.2.2.24 OR cpe:2.3:h:netgear:rax120:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rax120v2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.2.2.24 OR cpe:2.3:h:netgear:rax120v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rax70_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.5.108 OR cpe:2.3:h:netgear:rax70:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rax78_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.5.108 OR cpe:2.3:h:netgear:rax78:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbr10_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.24 OR cpe:2.3:h:netgear:rbr10:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.24 OR cpe:2.3:h:netgear:rbr20:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.24 OR cpe:2.3:h:netgear:rbr40:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbr50_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.24 OR cpe:2.3:h:netgear:rbr50:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs10_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.24 OR cpe:2.3:h:netgear:rbs10:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs20_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.24 OR cpe:2.3:h:netgear:rbs20:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.24 OR cpe:2.3:h:netgear:rbs40:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs50_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.24 OR cpe:2.3:h:netgear:rbs50:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rbs50y_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.7.4.12 OR cpe:2.3:h:netgear:rbs50y:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:wn3000rpv2_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.88 OR cpe:2.3:h:netgear:wn3000rpv2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:wnr2000v5_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.0.78 OR cpe:2.3:h:netgear:wnr2000v5:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:xr450_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.3.2.130 OR cpe:2.3:h:netgear:xr450:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:xr500_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.3.2.130 OR cpe:2.3:h:netgear:xr500:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:xr700_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.44 OR cpe:2.3:h:netgear:xr700:-:*:*:*:*:*:*:* Added Reference Type CVE: https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129 Types: Third Party Advisory Added Reference Type Zero Day Initiative: https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129 Types: Third Party Advisory Added Reference Type CVE: https://www.zerodayinitiative.com/advisories/ZDI-21-1116/ Types: Third Party Advisory Added Reference Type Zero Day Initiative: https://www.zerodayinitiative.com/advisories/ZDI-21-1116/ Types: Third Party Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129 Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-1116/ -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Received by [email protected]
May. 07, 2024
Action Type Old Value New Value Added Description NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of the soap_block_table file. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of root. . Was ZDI-CAN-13055. Added Reference Zero Day Initiative https://www.zerodayinitiative.com/advisories/ZDI-21-1116/ [No types assigned] Added Reference Zero Day Initiative https://kb.netgear.com/000064044/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-PSV-2021-0129 [No types assigned] Added CWE Zero Day Initiative CWE-787 Added CVSS V3 Zero Day Initiative AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H