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CVE-2018-21221

27
FAUCET Score

CVE-2018-21221 describes a critical buffer overflow vulnerability affecting specific NETGEAR D3600, D6000, and R9000 router models. This flaw allows an unauthenticated attacker on the local network to execute arbitrary code with high privileges, leading to complete compromise of confidentiality, integrity, and availability. While rated with a CVSS score of 8.8 (High), there is currently no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.2.52CPE matchmatch criteria
cpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:*
< 1.0.0.67CPE matchmatch criteria
cpe:2.3:o:netgear:d6000_firmware:*:*:*:*:*:*:*:*
< 1.0.0.67CPE matchmatch criteria
cpe:2.3:o:netgear:d3600_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.72%
Probability of exploitation in next 30 days
EPSS Percentile
50.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0072 is in the 55th percentile among its peer group of 1,857 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 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 / 000055116/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2459
Vendor Advisory