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CVE-2021-22909

25
FAUCET Score

CVE-2021-22909 is a high-severity vulnerability affecting EdgeMAX EdgeRouter V2.0.9 and earlier, allowing a malicious actor to perform a man-in-the-middle (MitM) attack during firmware updates. This vulnerability, with a CVSS score of 7.5, requires user interaction and high attack complexity, but could lead to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, nor publicly available exploit code, it has garnered minimal community discussion, with a single Reddit mention. The issue is resolved in EdgeMAX EdgeRouter V2.0.9-hotfix.1 and later.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.0.9CPE matchmatch criteria
cpe:2.3:o:ui:edgemax_edgerouter_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.29%
Probability of exploitation in next 30 days
EPSS Percentile
67.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0129 is in the 47th percentile among its peer group of 1,570 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.2 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.6 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

community.ui.com / releases/Security-Advisory-Bulletin-018-018/cfa1566b-4bf8-427b-8cc7-8cffba3a93a4
Vendor Advisory