VulnerabilityModified

CVE-2021-27254

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800.

HIGH 8.8EPSS 0.49%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.49%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R7800. Authentication is not required to exploit this vulnerability. The specific flaw exists within the apply_save.cgi endpoint. This issue results from the use of hard-coded encryption key. An attacker can leverage this vulnerability to execute arbitrary code in the context of root. Was ZDI-CAN-12287.

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: 0.49% probability · 40th percentile
CISA KEV: Not listed
Weakness: CWE-259, CWE-798
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

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-21-252/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-21-252/Third Party Advisory, VDB Entry

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.