CVE-2020-25340: An issue was discovered in NFStream 5.2.0

Routine

MEDIUM 5.5DOWNGRADE

CVE-2020-25340 is a medium-severity flaw (CVSS 5.5) affecting nfstream. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in NFStream 5.2.0. Because some allocated modules are not correctly freed, if the nfstream object is directly destroyed without being used after it is created, it will cause a memory leak that may result in a local denial of service (DoS).

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-401
Published	2021-02-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nfstream

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-16 15:15 UTCPublished CVE record published
2026-06-17 03:06 UTCUpdated Record last modified

nfstream nfstream DOWNGRADE

Affected: 5.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.0

1. Check installed version

apt-cache policy nfstream || rpm -q nfstream || nfstream --version

2. No fixed release: DOWNGRADE to a release before 5.2.0 (Debian / Ubuntu)

apt-cache madison nfstream sudo apt install nfstream=<VERSION_BEFORE_5.2.0> sudo apt-mark hold nfstream

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nfstream sudo dnf downgrade nfstream-<VERSION_BEFORE_5.2.0> sudo dnf versionlock add nfstream

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-25340?

nfstream: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-25340 being exploited?

CVE-2020-25340 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-25340 affect?

CVE-2020-25340 affects nfstream. Severity is medium (CVSS 5.5). An issue was discovered in NFStream 5.2.0. Because some allocated modules are not correctly freed, if the nfstream object is directly destroyed without being used after it is created, it will cause a memory leak that may result in a local d

How urgent is CVE-2020-25340?

Priority 31/100. Public exploit reference

References

← Back to latest CVEs