Is CVE-2020-4067 in the CISA KEV catalog?

No. CVE-2020-4067 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-4067?

CVE-2020-4067 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2020-4067?

CVE-2020-4067 has an EPSS score of 1.85% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-4067?

Upgrade coturn on debian 11 to 4.5.1.3-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-4067

HIGHEPSS 76th pctl

7.0

CVSS v3

NVD

Description

In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN response buffer is not initialized properly. There is a leak of information between different client connections. One client (an attacker) could use their connection to intelligently query coturn to get interesting bytes in the padding bytes from the connection of another client. This has been fixed in 4.5.1.3.

CWE-665

How to fix

Remediation Available

coturnDebian

Fixed in:4.5.1.3-1CVE-2020-4067

coturnUbuntu

Fixed in:4.5.0.3-1ubuntu0.3USN-4415-1

Fixed in:4.5.0.7-1ubuntu2.18.04.2USN-4415-1

Fixed in:4.5.1.1-1.1ubuntu0.20.04.1USN-4415-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

Exploit Intelligence

1.85%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Third-Party Advisory6

Release Notes1

github.com

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.