An exploitable denial of service vulnerability exists in the freeDiameter functionality of freeDiameter 1.3.2.

published 2020-07-28 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27252

cvss: 7.5; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.8%; EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits: 0; none known

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.

Patch / fix

distros 1

freediameter Debian 14, Debian 13, Debian 12 1.2.1-8

debian advisories DEBIAN-CVE-2020-6098

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-6098 updated 2025-11-21 cvss 6.5

freeDiameter: specially crafted Diameter request leads to DoS

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.76% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2020-1030 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

n/a freeDiameter

Classification

Weakness

CWE-191 Integer Underflow (Wrap or Wraparound)
CWE-787 Out-of-bounds Write

References

talosintelligence.com /vulnerability_reports/TALOS-2020-1030
exploit, third-party-advisory

Sources

CVE List CVE-2020-6098
NVD CVE-2020-6098

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary