How severe is CVE-2020-35711?

CVE-2020-35711 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-2020-35711 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35711?

CVE-2020-35711 affects Arc-swap Project Arc-swap. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35711?

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-2020-35711 published?

CVE-2020-35711 was published on 2020-12-25 and last updated on 2026-06-17.

CVE-2020-35711

CVE-2020-35711 is a high-severity vulnerability in Arc-swap Project Arc-swap 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Arc-swap Project Arc-swap
Published: 2020-12-25
Last modified: 2026-06-17

Description

An issue has been discovered in the arc-swap crate before 0.4.8 (and 1.x before 1.1.0) for Rust. Use of arc_swap::access::Map with the Constant test helper (or with a user-supplied implementation of the Access trait) could sometimes lead to dangling references being returned by the map.

Frequently asked questions

What is CVE-2020-35711?: An issue has been discovered in the arc-swap crate before 0.4.8 (and 1.x before 1.1.0) for Rust. Use of arc_swap::access::Map with the Constant test helper (or with a user-supplied implementation of the Access trait) could sometimes lead to dangling references being returned by the map.
How severe is CVE-2020-35711?: CVE-2020-35711 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-2020-35711 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35711?: CVE-2020-35711 affects Arc-swap Project Arc-swap. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35711?: 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-2020-35711 published?: CVE-2020-35711 was published on 2020-12-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:arc-swap_project:arc-swap:*:*:*:*:*:*:*:*