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CVE-2018-21127

27
FAUCET Score

CVE-2018-21127 describes a critical command injection vulnerability in NETGEAR WAC505 and WAC510 devices running firmware versions prior to 5.0.0.17. An unauthenticated attacker on the local network can exploit this flaw to execute arbitrary commands with high privileges. With a CVSS score of 8.8 (High), this vulnerability poses a significant risk due to its low attack complexity and potential for complete compromise of confidentiality, integrity, and availability. While no public exploit code or active exploitation has been observed, and community discussion is minimal, affected organizations should prioritize patching to mitigate this severe threat.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.0.0.17CPE matchmatch criteria
cpe:2.3:o:netgear:wac505_firmware:*:*:*:*:*:*:*:*
< 5.0.0.17CPE matchmatch criteria
cpe:2.3:o:netgear:wac510_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
1.39%
Probability of exploitation in next 30 days
EPSS Percentile
69.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0139 is in the 83rd percentile among its peer group of 1,875 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 / 000060231/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Wireless-Access-Points-PSV-2018-0263
Vendor Advisory