How severe is CVE-2021-45700?

CVE-2021-45700 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-2021-45700 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45700?

CVE-2021-45700 affects Nervos Ckb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45700?

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-2021-45700 published?

CVE-2021-45700 was published on 2021-12-27 and last updated on 2026-06-17.

CVE-2021-45700

CVE-2021-45700 is a high-severity vulnerability in Nervos Ckb 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: 7.8
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Nervos Ckb
Published: 2021-12-27
Last modified: 2026-06-17

Description

An issue was discovered in the ckb crate before 0.40.0 for Rust. Attackers can cause a denial of service (Nervos CKB blockchain node crash) via a dead call that is used as a DepGroup.

Frequently asked questions

What is CVE-2021-45700?: An issue was discovered in the ckb crate before 0.40.0 for Rust. Attackers can cause a denial of service (Nervos CKB blockchain node crash) via a dead call that is used as a DepGroup.
How severe is CVE-2021-45700?: CVE-2021-45700 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-2021-45700 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45700?: CVE-2021-45700 affects Nervos Ckb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45700?: 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-2021-45700 published?: CVE-2021-45700 was published on 2021-12-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nervos:ckb:*:*:*:*:*:rust:*:*

More vulnerabilities in Nervos Ckb

CVE-2021-45698 — Critical (CVSS 9.8): An issue was discovered in the ckb crate before 0.40.0 for Rust. A get_block_template RPC call may fail in situations…
CVE-2021-45699 — High (CVSS 7.5): An issue was discovered in the ckb crate before 0.40.0 for Rust. Remote attackers may be able to conduct a 51% attack…

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