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CVE-2021-4228

29
FAUCET Score

CVE-2021-4228 describes a critical vulnerability in Lanner Inc IAC-AST2500A standard firmware version 1.00.0, where a hard-coded TLS certificate enables Man-in-the-Middle (MitM) attacks despite HTTPS. With a CVSS score of 7.4 (High), this vulnerability is remotely exploitable with high impact on confidentiality and integrity, but requires high attack complexity. Currently, there is no known active exploitation, public exploit code, or Metasploit/Nuclei modules, though it has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
1.00.0CPE matchmatch criteria
cpe:2.3:o:lannerinc:iac-ast2500_firmware:1.00.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
1.6
Impact Score
3.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
9.95%
Probability of exploitation in next 30 days
EPSS Percentile
95.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0995 is in the 76th percentile among its peer group of 8,915 CVEs.

Social Chatter

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

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

nozominetworks.com / blog/vulnerabilities-in-bmc-firmware-affect-ot-iot-device-security-part-1
Third Party Advisory
nozominetworks.com / labs/vulnerability-advisories/cve-2021-4228
Third Party Advisory