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Fencer Vulns
medium 5.9

CVE-2020-6062 json

An exploitable denial-of-service vulnerability exists in the way CoTURN 4.5.1.1 web server parses POST requests.

published 2020-02-19 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27216

cvss
5.9
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
6.3%
EPSS 6.3% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

An exploitable denial-of-service vulnerability exists in the way CoTURN 4.5.1.1 web server parses POST requests. A specially crafted HTTP POST request can lead to server crash and denial of service. An attacker needs to send an HTTP request to trigger this vulnerability.

Patch / fix

  • coturn Debian 14, Debian 13, Debian 12 4.5.1.1-1.2

debian advisories DEBIAN-CVE-2020-6062

  • coturn Ubuntu 16.04 LTS 4.5.0.3-1ubuntu0.3
  • coturn Ubuntu 18.04 LTS 4.5.0.7-1ubuntu2.18.04.2
  • coturn Ubuntu 20.04 LTS 4.5.1.1-1.1ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2020-6062

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2020-6062 updated cvss 7.5

coturn: specially crafted HTTP POST request can lead to server crash and denial of service

  • 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

6.27% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2020-0985 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 5.9 CVSS:3.0/AV:N/AC:H/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 CoTURN

Classification

Weakness

References

Sources

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.