High severity7.5NVD Advisory· Published Dec 27, 2021· Updated Jun 17, 2026

CVE-2021-45699

Description

An issue was discovered in the ckb crate before 0.40.0 for Rust. Remote attackers may be able to conduct a 51% attack against the Nervos CKB blockchain by triggering an inability to allocate memory for the misbehavior HashMap.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
ckbcrates.io	< 0.40.0	0.40.0

Affected products

Nervos/Ckb
cpe:2.3:a:nervos:ckb:*:*:*:*:*:rust:*:*
Range: <0.40.0
ckb/ckbdescription
ghsa-coords
pkg:cargo/ckb
Range: < 0.40.0

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-2969-8hh9-57jcghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2021-45699ghsaADVISORY
raw.githubusercontent.com/rustsec/advisory-db/main/crates/ckb/RUSTSEC-2021-0108.mdnvdThird Party AdvisoryWEB
rustsec.org/advisories/RUSTSEC-2021-0108.htmlnvdThird Party AdvisoryWEB
github.com/nervosnetwork/ckb/security/advisories/GHSA-48vq-8jqv-gm6fghsaWEB

News mentions

No linked articles in our index yet.

cvss	0.488
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000