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CVE-2021-45720

25
FAUCET Score

CVE-2021-45720 is a use-after-free vulnerability affecting the lru crate for Rust, specifically versions prior to 0.7.1, where iterators can access memory after a pop operation. This vulnerability carries a CVSS score of 7.5 (HIGH), indicating it can be exploited remotely with low attack complexity, potentially leading to high availability impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.7.1CPE matchmatch criteria
cpe:2.3:a:lru_project:lru:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.18%
Probability of exploitation in next 30 days
EPSS Percentile
64.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0118 is in the 43rd percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: lruFixed in: 0.7.1

Vendor Advisories (1)

rustGHSA-v362-2895-h9r2high

Use After Free in lru

Jan 7, 2022

References

raw.githubusercontent.com / rustsec/advisory-db/main/crates/lru/RUSTSEC-2021-0130.md
Third Party Advisory
rustsec.org / advisories/RUSTSEC-2021-0130.html
ExploitIssue TrackingThird Party Advisory