What is the CVSS score of CVE-2021-27255?

CVE-2021-27255 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 1.3%.

Is there a patch available for CVE-2021-27255?

Yes, a patch is available for CVE-2021-27255. Update the affected software to the latest version immediately.

Br200 Firmware CVE-2021-27255

HIGH

Missing Authentication for Critical Function (CWE-306)

2021-03-05 zdi-disclosures@trendmicro.com

Netgear RCE Authentication Bypass Br200 Firmware Br500 Firmware D7800 Firmware Ex6100V2 Firmware Ex6150V2 Firmware Ex6250 Firmware Ex6400 Firmware Ex6400V2 Firmware Ex6410 Firmware Ex6420 Firmware Ex7300 Firmware Ex7300V2 Firmware Ex7320 Firmware Ex7700 Firmware Ex8000 Firmware Lbr20 Firmware R7800 Firmware R8900 Firmware R9000 Firmware Rbk12 Firmware Rbk13 Firmware Rbk14 Firmware Rbk15 Firmware Rbk20 Firmware Rbk23 Firmware Rbk40 Firmware Rbk43 Firmware Rbk43S Firmware Rbk44 Firmware Rbk50 Firmware Rbk53 Firmware Rbr10 Firmware Rbr20 Firmware Rbr40 Firmware Rbr50 Firmware Rbs10 Firmware Rbs20 Firmware Rbs40 Firmware Rbs50 Firmware Rbs50Y Firmware Xr450 Firmware Xr500 Firmware Xr700 Firmware

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Mar 05, 2021 - 20:15 nvd

HIGH 8.8

DescriptionNVD

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.

AnalysisAI

This vulnerability allows remote attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Rated high severity (CVSS 8.8), this vulnerability is no authentication required, low attack complexity. This Missing Authentication for Critical Function vulnerability could allow attackers to access critical functionality without authentication.

Technical ContextAI

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. 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. Affected products include: Netgear Br200 Firmware, Netgear Br500 Firmware, Netgear D7800 Firmware, Netgear Ex6100V2 Firmware, Netgear Ex6150V2 Firmware. Version information: version 1.0.2.76..

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Require authentication for all sensitive operations, implement defense in depth.