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CVE-2018-21131

27
FAUCET Score

CVE-2018-21131 describes an unauthenticated firmware downgrade vulnerability impacting NETGEAR WAC505 and WAC510 devices running firmware versions prior to 5.0.0.17. This critical vulnerability (CVSS 9.1) allows an unauthenticated attacker to remotely downgrade the device's firmware, leading to high integrity and availability impacts. While no active exploitation, public exploit code, or significant community discussion has been observed, the potential for unauthorized system modification and disruption remains high.

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

8.1HIGH

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.28%
Probability of exploitation in next 30 days
EPSS Percentile
67.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0128 is in the 53rd 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 / 000060244/Security-Advisory-for-Unauthenticated-Firmware-Downgrade-on-Some-Wireless-Access-Points-PSV-2018-0269
Vendor Advisory