Is CVE-2021-27256 actively exploited?

CVE-2021-27256 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-27256?

CVE-2021-27256 has a CVSS score of 8.8 (HIGH severity). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-27256?

Patch guidance is available from netgear security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-27256.

Fix CVE-2021-27256 - HIGH netgear br200 firmware

Q: Which products are affected by CVE-2021-27256?

43 products: netgear br200 firmware, netgear br500 firmware, netgear d7800 firmware, netgear ex6100v2 firmware, netgear ex6150v2 firmware, and 38 more.

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_save.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12355.

CVSS Metrics

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: adjacent network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-78 · OS Command Injection

Metadata

Primary Vendor: NETGEAR
Published: 3/5/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

netgear : br200_firmwarenetgear : br500_firmwarenetgear : d7800_firmwarenetgear : ex6100v2_firmwarenetgear : ex6150v2_firmwarenetgear : ex6250_firmwarenetgear : ex6400_firmwarenetgear : ex6400v2_firmwarenetgear : ex6410_firmwarenetgear : ex6420_firmwarenetgear : ex7300_firmwarenetgear : ex7300v2_firmwarenetgear : ex7320_firmwarenetgear : ex7700_firmwarenetgear : ex8000_firmwarenetgear : lbr20_firmwarenetgear : r7800_firmwarenetgear : r8900_firmwarenetgear : r9000_firmwarenetgear : rbk12_firmwarenetgear : rbk13_firmwarenetgear : rbk14_firmwarenetgear : rbk15_firmwarenetgear : rbk20_firmwarenetgear : rbk23_firmwarenetgear : rbk40_firmwarenetgear : rbk43_firmwarenetgear : rbk43s_firmwarenetgear : rbk44_firmwarenetgear : rbk50_firmwarenetgear : rbk53_firmwarenetgear : rbr10_firmwarenetgear : rbr20_firmwarenetgear : rbr40_firmwarenetgear : rbr50_firmwarenetgear : rbs10_firmwarenetgear : rbs20_firmwarenetgear : rbs40_firmwarenetgear : rbs50_firmwarenetgear : rbs50y_firmwarenetgear : xr450_firmwarenetgear : xr500_firmwarenetgear : xr700_firmware

Remediation Guidance

Executive Summary

View on NIST NVD