How severe is CVE-2020-36443?

CVE-2020-36443 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-2020-36443 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36443?

CVE-2020-36443 affects Libp2p Libp2p-deflate. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36443?

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-2020-36443 published?

CVE-2020-36443 was published on 2021-08-08 and last updated on 2026-06-17.

CVE-2020-36443

CVE-2020-36443 is a critical-severity vulnerability in Libp2p Libp2p-deflate 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. The underlying weakness is classified as CWE-908.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-908
Affected product: Libp2p Libp2p-deflate
Published: 2021-08-08
Last modified: 2026-06-17

Description

An issue was discovered in the libp2p-deflate crate before 0.27.1 for Rust. An uninitialized buffer is passed to AsyncRead::poll_read(), which is a user-provided trait function.

Frequently asked questions

What is CVE-2020-36443?: An issue was discovered in the libp2p-deflate crate before 0.27.1 for Rust. An uninitialized buffer is passed to AsyncRead::poll_read(), which is a user-provided trait function.
How severe is CVE-2020-36443?: CVE-2020-36443 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-2020-36443 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36443?: CVE-2020-36443 affects Libp2p Libp2p-deflate. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36443?: 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-2020-36443 published?: CVE-2020-36443 was published on 2021-08-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libp2p:libp2p-deflate:*:*:*:*:*:rust:*:*

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