CVE-2020-22650: A memory leak vulnerability in sim-organizer.c of AlienVault Ossim v5 causes a denial of service (DOS) via a s

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HIGH 7.5REMOTEDOWNGRADE

CVE-2020-22650 is a high-severity flaw (CVSS 7.5) affecting alienvault ossim. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A memory leak vulnerability in sim-organizer.c of AlienVault Ossim v5 causes a denial of service (DOS) via a system crash triggered by the occurrence of a large number of alarm events.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-401
Published	2021-07-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: att

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

Am I affected?

Timeline

2021-07-19 17:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

att alienvault ossim DOWNGRADE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

1. Check installed version

apt-cache policy alienvault-ossim || rpm -q alienvault-ossim || alienvault-ossim --version

2. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison alienvault-ossim sudo apt install alienvault-ossim=<VERSION_BEFORE_5.0> sudo apt-mark hold alienvault-ossim

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

dnf --showduplicates list alienvault-ossim sudo dnf downgrade alienvault-ossim-<VERSION_BEFORE_5.0> sudo dnf versionlock add alienvault-ossim

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-2020-22650?

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

Is CVE-2020-22650 being exploited?

CVE-2020-22650 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-2020-22650 affect?

CVE-2020-22650 affects alienvault ossim. Severity is high (CVSS 7.5). A memory leak vulnerability in sim-organizer.c of AlienVault Ossim v5 causes a denial of service (DOS) via a system crash triggered by the occurrence of a large number of alarm events.

How urgent is CVE-2020-22650?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

References

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