CVE-2021-42074
CVSS v3
7.5
HIGH
EPSS Score
1.8 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2021-11-08
Frequently asked questions
What is CVE-2021-42074?
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.
Is CVE-2021-42074 actively exploited?
Active exploitation of CVE-2021-42074 has not been confirmed. Its EPSS score was 1.8% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-42074?
CVE-2021-42074 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-42074 affecting your environment?
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