CVE-2020-6098: An exploitable denial of service vulnerability exists in the freeDiameter functionality of freeDiameter 1.3.2

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2020-6098 is a high-severity flaw (CVSS 7.5) affecting freediameter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An exploitable denial of service vulnerability exists in the freeDiameter functionality of freeDiameter 1.3.2. A specially crafted Diameter request can trigger a memory corruption resulting in denial-of-service. An attacker can send a malicious packet to trigger this vulnerability.

Why this priority

High severity
Public exploit reference
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	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-191, CWE-787
Published	2020-07-28
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: freediameter

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

Am I affected?

Timeline

2020-07-28 22:15 UTCPublished CVE record published
2026-06-17 03:22 UTCUpdated Record last modified

freediameter freediameter DOWNGRADE

Affected: 1.3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.2 (Debian / Ubuntu)

apt-cache madison freediameter sudo apt install freediameter=<VERSION_BEFORE_1.3.2> sudo apt-mark hold freediameter

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

dnf --showduplicates list freediameter sudo dnf downgrade freediameter-<VERSION_BEFORE_1.3.2> sudo dnf versionlock add freediameter

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-2020-6098?

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

Is CVE-2020-6098 being exploited?

CVE-2020-6098 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-2020-6098 affect?

CVE-2020-6098 affects freediameter. Severity is high (CVSS 7.5). An exploitable denial of service vulnerability exists in the freeDiameter functionality of freeDiameter 1.3.2. A specially crafted Diameter request can trigger a memory corruption resulting in denial-of-service. An attacker can send a malic

How urgent is CVE-2020-6098?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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