CVE-2021-34947
NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability
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.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability
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.
- Record
CVE-2021-34947- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2021-21594
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.
- Record
EUVD-2021-21594- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jj28-565j-58r3
NETGEAR R7800 net-cgi Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability...
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.
- Record
GHSA-jj28-565j-58r3- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-34947- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
Affected products
- netgear r7800
- netgear d7800 firmware
- netgear ex2700 firmware
- netgear ex6100 firmware
- netgear ex6150 firmware
- netgear ex6200 firmware
- netgear ex6250 firmware
- netgear ex6400 firmware
- netgear ex6400v2 firmware
- netgear ex6410 firmware
- netgear ex6420 firmware
- netgear ex6500v1 firmware
Show 30 moreShow less
- netgear ex7300 firmware
- netgear ex7300v2 firmware
- netgear ex7320 firmware
- netgear ex7700 firmware
- netgear ex8000 firmware
- netgear lbr1020 firmware
- netgear lbr20 firmware
- netgear r6700ax firmware
- netgear r7800 firmware
- netgear r8900 firmware
- netgear r9000 firmware
- netgear rax10 firmware
- netgear rax120 firmware
- netgear rax120v2 firmware
- netgear rax70 firmware
- netgear rax78 firmware
- netgear rbr10 firmware
- netgear rbr20 firmware
- netgear rbr40 firmware
- netgear rbr50 firmware
- netgear rbs10 firmware
- netgear rbs20 firmware
- netgear rbs40 firmware
- netgear rbs50 firmware
- netgear rbs50y firmware
- netgear wn3000rpv2 firmware
- netgear wnr2000v5 firmware
- netgear xr450 firmware
- netgear xr500 firmware
- netgear xr700 firmware
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-34947 is a high vulnerability (CVSS 8.8) in Netgear R7800, published May 7, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. No source names a fixed version.