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CVE-2021-37439

22
FAUCET Score

CVE-2021-37439 describes a path traversal vulnerability in NCH FlexiServer v6.00, specifically through the syslog?file=/.. parameter. This vulnerability carries a CVSS score of 6.5 (Medium), indicating it can be exploited remotely with low attack complexity and requires low privileges, potentially leading to high confidentiality impact. There is currently no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit or Nuclei, and it has garnered minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.00CPE matchmatch criteria
cpe:2.3:a:nch:flexiserver:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.21%
Probability of exploitation in next 30 days
EPSS Percentile
65.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0121 is in the 79th percentile among its peer group of 21,958 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

github.com / 0xfml/poc/blob/main/NCH/Flexiserver_6.00_LFI.md
ExploitThird Party Advisory
nchsoftware.com / flexi/index.html
Product