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CVE-2020-11939

25
FAUCET Score

CVE-2020-11939 is a critical vulnerability affecting nDPI through version 3.2 Stable, specifically within its SSH protocol dissector. It involves multiple KEXINIT integer overflows leading to a controlled remote heap overflow in the concat_hash_string function, impacting network inspection stacks utilizing nDPI for traffic analysis. With a CVSS score of 9.8 (Critical), this vulnerability allows for unauthenticated remote code execution due to its low attack complexity and high impact on confidentiality, integrity, and availability. Despite its severity and high FAUCET Risk Score of 87/100, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.2CPE matchmatch criteria
cpe:2.3:a:ntop:ndpi:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.30%
Probability of exploitation in next 30 days
EPSS Percentile
87.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0330 is in the 79th percentile among its peer group of 36,835 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / ntop/nDPI/commit/7ce478a58b4dd29a8d1e6f4e9df2f778613d9202
PatchThird Party Advisory
securitylab.github.com / advisories/GHSL-2020-051_052-ntop-ndpi
ExploitThird Party Advisory