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CVE-2021-38530

31
FAUCET Score

CVE-2021-38530 is a critical command injection vulnerability affecting various NETGEAR Orbi mesh WiFi systems, including models like the RBK40, RBR40, and RBK50, running firmware versions prior to 2.5.1.16 (or 2.6.1.40 for RBS50Y). This flaw allows an unauthenticated attacker to execute arbitrary commands on the affected devices. With a CVSS score of 9.8, it presents a critical risk due to its network-based attack vector, low attack complexity, and high potential for complete compromise of confidentiality, integrity, and availability. While there is no confirmed active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.5.1.16CPE matchmatch criteria
cpe:2.3:o:netgear:rbk40_firmware:*:*:*:*:*:*:*:*
< 2.5.1.16CPE matchmatch criteria
cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:*
< 2.5.1.16CPE matchmatch criteria
cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:*
< 2.5.1.16CPE matchmatch criteria
cpe:2.3:o:netgear:rbk20_firmware:*:*:*:*:*:*:*:*
< 2.5.1.16CPE matchmatch criteria
cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.6CRITICAL

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.22%
Probability of exploitation in next 30 days
EPSS Percentile
80.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0222 is in the 70th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

kb.netgear.com / 000063770/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-WiFi-Systems-PSV-2019-0151
Vendor Advisory