Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-27239

Severity CVSS v4.0:
Pending analysis
Type:
CWE-121 Stack-based Buffer Overflow
Publication date:
29/03/2021
Last modified:
02/04/2021

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6400 and R6700 firmware version 1.0.4.98 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the upnpd service, which listens on UDP port 1900 by default. A crafted MX header field in an SSDP message can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11851.

Impact

Vector 3.x
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
8.80
Severity 3.x
HIGH
Vector 2.0
AV:A/AC:L/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 8.30 HIGH
Vector: AV:A/AC:L/Au:N/C:C/I:C/A:C

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
8.30
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:netgear:d6220_firmware:*:*:*:*:*:*:*:* 1.0.0.68 (excluding)
cpe:2.3:h:netgear:d6220:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:d6400_firmware:*:*:*:*:*:*:*:* 1.0.0.102 (excluding)
cpe:2.3:h:netgear:d6400:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:d7000_firmware:*:*:*:*:*:*:*:* 1.0.0.66 (excluding)
cpe:2.3:h:netgear:d7000:v2:*:*:*:*:*:*:*
cpe:2.3:o:netgear:d8500_firmware:*:*:*:*:*:*:*:* 1.0.3.60 (excluding)
cpe:2.3:h:netgear:d8500:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:dc112a_firmware:*:*:*:*:*:*:*:* 1.0.0.54 (excluding)
cpe:2.3:h:netgear:dc112a:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex7000_firmware:*:*:*:*:*:*:*:* 1.0.1.94 (excluding)
cpe:2.3:h:netgear:ex7000:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex7500_firmware:*:*:*:*:*:*:*:* 1.0.0.72 (excluding)
cpe:2.3:h:netgear:ex7500:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6250_firmware:*:*:*:*:*:*:*:* 1.0.4.48 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools