CVE-2021-42076
CVE-2021-42076 is a high-severity vulnerability in Barrier Project Barrier with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 2% (72nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Barrier Project Barrier
- Published:
- Last modified:
Description
An issue was discovered in Barrier before 2.3.4. An attacker can cause memory exhaustion in the barriers component (aka the server-side implementation of Barrier) and barrierc by sending long TCP messages.
Frequently asked questions
- What is CVE-2021-42076?
- An issue was discovered in Barrier before 2.3.4. An attacker can cause memory exhaustion in the barriers component (aka the server-side implementation of Barrier) and barrierc by sending long TCP messages.
- How severe is CVE-2021-42076?
- CVE-2021-42076 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-42076 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-42076?
- CVE-2021-42076 affects Barrier Project Barrier. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-42076?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-42076 published?
- CVE-2021-42076 was published on 2021-11-08 and last updated on 2026-06-17.
References
- http://www.openwall.com/lists/oss-security/2021/11/02/4
- https://github.com/debauchee/barrier/releases/tag/v2.3.4
Affected products (1)
- cpe:2.3:a:barrier_project:barrier:*:*:*:*:*:*:*:*
More vulnerabilities in Barrier Project Barrier
- CVE-2021-42072 — High (CVSS 8.8): An issue was discovered in Barrier before 2.4.0. The barriers component (aka the server-side implementation of Barrier)…
- CVE-2021-42073 — High (CVSS 8.2): An issue was discovered in Barrier before 2.4.0. An attacker can enter an active session state with the barriers…
- CVE-2021-42075 — High (CVSS 7.5): An issue was discovered in Barrier before 2.3.4. The barriers component (aka the server-side implementation of Barrier)…
- CVE-2021-42074 — High (CVSS 7.5): An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the…
All CVEs affecting Barrier Project Barrier →
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