How severe is CVE-2019-15541?

CVE-2019-15541 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-2019-15541 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-15541?

CVE-2019-15541 affects Rustls Project Rustls. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-15541?

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-2019-15541 published?

CVE-2019-15541 was published on 2019-08-26 and last updated on 2026-06-17.

CVE-2019-15541

CVE-2019-15541 is a high-severity vulnerability in Rustls Project Rustls 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-88.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-88
Affected product: Rustls Project Rustls
Published: 2019-08-26
Last modified: 2026-06-17

Description

rustls-mio/examples/tlsserver.rs in the rustls crate before 0.16.0 for Rust allows attackers to cause a denial of service (loop of conn_event and ready) by arranging for a client to never be writable.

Frequently asked questions

What is CVE-2019-15541?: rustls-mio/examples/tlsserver.rs in the rustls crate before 0.16.0 for Rust allows attackers to cause a denial of service (loop of conn_event and ready) by arranging for a client to never be writable.
How severe is CVE-2019-15541?: CVE-2019-15541 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-2019-15541 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-15541?: CVE-2019-15541 affects Rustls Project Rustls. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-15541?: 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-2019-15541 published?: CVE-2019-15541 was published on 2019-08-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rustls_project:rustls:*:*:*:*:*:*:*:*

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