PatchTheCVECVE-2021-45720: An issue was discovered in the lru crate before 0.7.1 for Rust
CVE-2021-45720 is a high-severity flaw (CVSS 7.5) affecting lru. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in the lru crate before 0.7.1 for Rust. The iterators have a use-after-free, as demonstrated by an access after a pop operation.
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.2% (top 31%) |
| CISA exploited list | No |
| Weakness | CWE-416 |
| Published | 2021-12-26 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-45720?
lru: upgrade to 0.7.1. Exact commands for each OS are on this page.
Is CVE-2021-45720 being exploited?
CVE-2021-45720 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-45720 affect?
CVE-2021-45720 affects lru. Severity is high (CVSS 7.5). An issue was discovered in the lru crate before 0.7.1 for Rust. The iterators have a use-after-free, as demonstrated by an access after a pop operation.
How urgent is CVE-2021-45720?
Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action