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CVE-2021-47814

30
FAUCET Score

CVE-2021-47814 is a denial-of-service vulnerability affecting NBMonitor 1.6.8, caused by an input validation error in the registration code field. An attacker can crash the application and potentially destabilize the system by providing a 256-character buffer. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a high impact on availability with low attack complexity and no user interaction required. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, suggesting awareness among researchers.

Impacted Technologies

VendorProductVersion(s)CPE
1.6.8CPE matchmatch criteria
cpe:2.3:a:nsasoft:nbmonitor:1.6.8:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.7MEDIUM

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
ACTIVE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.36%
Probability of exploitation in next 30 days
EPSS Percentile
28.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0036 is in the 9th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

exploit-db.com / exploits/49964
ExploitThird Party Advisory
vulncheck.com / advisories/nbmonitor-denial-of-service-poc
Third Party Advisory
nsauditor.com
Product