How severe is CVE-2019-15522?

CVE-2019-15522 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-15522 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-15522?

CVE-2019-15522 affects Linbit Csync2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-15522?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-15522 published?

CVE-2019-15522 was published on 2020-03-20 and last updated on 2026-06-17.

CVE-2019-15522

CVE-2019-15522 is a critical-severity vulnerability in Linbit Csync2 with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Linbit Csync2
Published: 2020-03-20
Last modified: 2026-06-17

Description

An issue was discovered in LINBIT csync2 through 2.0. csync_daemon_session in daemon.c neglects to force a failure of a hello command when the configuration requires use of SSL.

Frequently asked questions

What is CVE-2019-15522?: An issue was discovered in LINBIT csync2 through 2.0. csync_daemon_session in daemon.c neglects to force a failure of a hello command when the configuration requires use of SSL.
How severe is CVE-2019-15522?: CVE-2019-15522 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-15522 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-15522?: CVE-2019-15522 affects Linbit Csync2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-15522?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-15522 published?: CVE-2019-15522 was published on 2020-03-20 and last updated on 2026-06-17.

References

https://github.com/LINBIT/csync2/commit/416f1de878ef97e27e27508914f7ba8599a0be22

Affected products (1)

cpe:2.3:a:linbit:csync2:*:*:*:*:*:*:*:*

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CVE-2019-15523 — Medium (CVSS 5.3): An issue was discovered in LINBIT csync2 through 2.0. It does not correctly check for the return value…

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