CVE-2020-25340

Local service interruption via incomplete flow deallocation

Published Feb 16, 2021 · Updated Aug 4, 2024

Memory leak in NFStream 5.2.0 allows local users to interrupt service by creating and immediately destroying an unused nfstream object. The NFStream plugin calls nDPI's ndpi_flow_free() during object destruction, but that routine fails to release every dynamically allocated member of ndpi_flow_struct. Repeated local construction and destruction of unused objects consumes process memory and can exhaust resources, while confidentiality and integrity remain unaffected.

CVSS severity5.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in NFStream 5.2.0 allows local users to interrupt service by creating and immediately destroying an unused nfstream object. The NFStream plugin calls nDPI's ndpi_flow_free() during object destruction, but that routine fails to release every dynamically allocated member of ndpi_flow_struct. Repeated local construction and destruction of unused objects consumes process memory and can exhaust resources, while confidentiality and integrity remain unaffected.

The record

CVE
CVE-2020-25340
Published
Feb 16, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8GitHub Advisory DatabaseCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.1NVDAV:L/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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