What’s Vulnerable › Vulnerabilities

CVE-2021-45698

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-27 · updated 2026-06-17

Description

An issue was discovered in the ckb crate before 0.40.0 for Rust. A get_block_template RPC call may fail in situations where it is supposed to select a Nervos CKB blockchain transaction with a higher fee rate than another transaction.

Affected products

• Nervos Ckb: before 0.40.0 — fixed in 0.40.0

How to fix

Upgrade to a fixed version: Nervos Ckb 0.40.0. Check the vendor advisory for mitigations.

References

• https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/ckb/RUSTSEC-2021-0107.md
• https://rustsec.org/advisories/RUSTSEC-2021-0107.html
• https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/ckb/RUSTSEC-2021-0107.md
• https://rustsec.org/advisories/RUSTSEC-2021-0107.html

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