How severe is CVE-2020-11940?

CVE-2020-11940 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-11940 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-11940?

CVE-2020-11940 affects Ntop Ndpi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-11940?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-11940 published?

CVE-2020-11940 was published on 2020-04-23 and last updated on 2026-06-17.

CVE-2020-11940

CVE-2020-11940 is a high-severity vulnerability in Ntop Ndpi with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Ntop Ndpi
Published: 2020-04-23
Last modified: 2026-06-17

Description

In nDPI through 3.2 Stable, an out-of-bounds read in concat_hash_string in ssh.c can be exploited by a network-positioned attacker that can send malformed SSH protocol messages on a network segment monitored by nDPI's library.

Frequently asked questions

What is CVE-2020-11940?: In nDPI through 3.2 Stable, an out-of-bounds read in concat_hash_string in ssh.c can be exploited by a network-positioned attacker that can send malformed SSH protocol messages on a network segment monitored by nDPI's library.
How severe is CVE-2020-11940?: CVE-2020-11940 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-11940 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-11940?: CVE-2020-11940 affects Ntop Ndpi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-11940?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-11940 published?: CVE-2020-11940 was published on 2020-04-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ntop:ndpi:*:*:*:*:*:*:*:*

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