CVE-2021-45684

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 35% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in the flumedb crate through 2021-01-07 for Rust. read_entry may read from uninitialized memory locations.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
64.7%
KEV
Not listed

Published

December 27, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

RUSTSEC-2021-0086: flumedb: `Read` on uninitialized buffer may cause UB ( `read_entry()` ) › RustSec Advisory Database

https://rustsec.org/advisories/RUSTSEC-2021-0086.html
generic
https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/flumedb/RUSTSEC-2021-0086.md

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
flumedb—0.1.6—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-07-23 02:05 UTCEG score recompute
  2. 2026-07-22 22:52 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-45684?
CVE-2021-45684 is a critical vulnerability published on December 27, 2021. An issue was discovered in the flumedb crate through 2021-01-07 for Rust. read_entry may read from uninitialized memory locations.
When was CVE-2021-45684 disclosed?
CVE-2021-45684 was first published in the National Vulnerability Database on December 27, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-45684 actively exploited?
CVE-2021-45684 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-45684?
CVE-2021-45684 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-45684?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-45684, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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