Is CVE-2021-42074 in the CISA KEV catalog?

No. CVE-2021-42074 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42074?

CVE-2021-42074 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-42074?

CVE-2021-42074 has an EPSS score of 1.70% (74th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42074?

Upgrade barrier to 2.3.4 or later.

CVE & CISA-KEV Catalog

CVE-2021-42074

HIGHEPSS 74th pctl

7.5

CVSS v3

NVD

Description

An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.

CWE-416Use After Free

How to fix

Remediation Available

barrierNVD

Affected:< 2.3.4Fixed in:2.3.4CVE-2021-42074derived from NVD

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.70%probability of exploitation in 30 days

74thpercentile

Elevated risk: more likely to be exploited than 74% of all known CVEs.

References

Exploit1

openwall.com

Third-Party Advisory1

github.com

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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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.