PatchTheCVECVE-2021-30454: An issue was discovered in the outer_cgi crate before 0.2.1 for Rust
CVE-2021-30454 is a critical-severity flaw (CVSS 9.8) affecting outer cgi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in the outer_cgi crate before 0.2.1 for Rust. A user-provided Read instance receives an uninitialized memory buffer from KeyValueReader.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 33%) |
| CISA exploited list | No |
| Weakness | CWE-119 |
| Published | 2021-04-07 |
| 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-2021-30454?
outer cgi: upgrade to 0.2.1. Exact commands for each OS are on this page.
Is CVE-2021-30454 being exploited?
CVE-2021-30454 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-2021-30454 affect?
CVE-2021-30454 affects outer cgi. Severity is critical (CVSS 9.8). An issue was discovered in the outer_cgi crate before 0.2.1 for Rust. A user-provided Read instance receives an uninitialized memory buffer from KeyValueReader.
How urgent is CVE-2021-30454?
Priority 56/100. Critical severity; Remotely exploitable, no login, no user action