CVE-2021-27255
This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
This vulnerability allows remote attackers to execute arbitrary code 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 refresh_status.aspx endpoint. The issue results from a lack of authentication required to start a service on the server. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12360.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.40% probability · 72th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-306
- Affected
- netgear/br200 firmware · netgear/br500 firmware · netgear/d7800 firmware · netgear/ex6100v2 firmware · netgear/ex6150v2 firmware · netgear/ex6250 firmware · netgear/ex6400 firmware · netgear/ex6400v2 firmware · netgear/ex6410 firmware · netgear/ex6420 firmware · netgear/ex7300 firmware · netgear/ex7300v2 firmware · netgear/ex7320 firmware · netgear/ex7700 firmware · netgear/ex8000 firmware · netgear/lbr20 firmware · netgear/r7800 firmware · netgear/r8900 firmware · netgear/r9000 firmware · netgear/rbk12 firmware · +23 more
- Source
- zdi-disclosures@trendmicro.com
EPSS 1.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-ExtendersPatch, Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-263/Third Party Advisory, VDB Entry
- https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-ExtendersPatch, Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-263/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.