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CRITICAL

CVE-2020-11939

CVSS v3

9.8

CRITICAL

EPSS Score

3.3 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • ndpiUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • ndpiUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • ndpiUbuntu:24.10all versions · no fixed version listed
  • ndpiUbuntu:24.04:LTSall versions · no fixed version listed
  • ndpiUbuntu:22.04:LTSall versions · no fixed version listed
  • ndpiUbuntu:20.04:LTSall versions · no fixed version listed

Full record on NVD

Description

In nDPI through 3.2 Stable, the SSH protocol dissector has multiple KEXINIT integer overflows that result in a controlled remote heap overflow in concat_hash_string in ssh.c. Due to the granular nature of the overflow primitive and the ability to control both the contents and layout of the nDPI library's heap memory through remote input, this vulnerability may be abused to achieve full Remote Code Execution against any network inspection stack that is linked against nDPI and uses it to perform network traffic analysis.

Technical details

Published
2020-04-23

Frequently asked questions

What is CVE-2020-11939?

In nDPI through 3.2 Stable, the SSH protocol dissector has multiple KEXINIT integer overflows that result in a controlled remote heap overflow in concat_hash_string in ssh.c. Due to the granular nature of the overflow primitive and the ability to control both the contents and layout of the nDPI library's heap memory through remote input, this vulnerability may be abused to achieve full Remote Code Execution against any network inspection stack that is linked against nDPI and uses it to perform network traffic analysis.

Is CVE-2020-11939 actively exploited?

Active exploitation of CVE-2020-11939 has not been confirmed. Its EPSS score was 3.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-11939?

CVE-2020-11939 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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