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CVE-2020-17408

58
FAUCET Score

CVE-2020-17408 is a critical XML External Entity (XXE) vulnerability affecting NEC ExpressCluster 4.1, allowing unauthenticated remote attackers to disclose sensitive information. The flaw in the clpwebmc executable enables attackers to craft a malicious XML document that forces the parser to access and embed contents from a specified URI, leading to information disclosure in the context of SYSTEM. With a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network without user interaction. While no public exploit code or active exploitation has been observed, and community discussion is minimal, its high FAUCET Risk Score of 83/100 indicates a significant potential risk.

Impacted Technologies

VendorProductVersion(s)CPE
4.1CPE matchmatch criteria
cpe:2.3:a:nec:expresscluster_x:4.1:*:*:*:*:windows:*:*
4.2CPE matchmatch criteria
cpe:2.3:a:nec:expresscluster_x:4.2:*:*:*:*:windows:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
73.96%
Probability of exploitation in next 30 days
EPSS Percentile
99.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.7396 is in the 99th percentile among its peer group of 51,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

support.nec.co.jp / en/View.aspx
PatchVendor Advisory
zerodayinitiative.com / advisories/ZDI-20-1102
Third Party AdvisoryVDB Entry