PatchTheCVECVE-2021-45711: An issue was discovered in the simple_asn1 crate 0.6.0 before 0.6.1 for Rust
CVE-2021-45711 is a high-severity flaw (CVSS 7.5) affecting simple asn1. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in the simple_asn1 crate 0.6.0 before 0.6.1 for Rust. There is a panic if UTCTime data, supplied by a remote attacker, has a second character greater than 0x7f.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.4% (top 28%) |
| CISA exploited list | No |
| Weakness | CWE-20 |
| Published | 2021-12-27 |
| 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-2021-45711?
simple asn1: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-45711 being exploited?
CVE-2021-45711 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-2021-45711 affect?
CVE-2021-45711 affects simple asn1. Severity is high (CVSS 7.5). An issue was discovered in the simple_asn1 crate 0.6.0 before 0.6.1 for Rust. There is a panic if UTCTime data, supplied by a remote attacker, has a second character greater than 0x7f.
How urgent is CVE-2021-45711?
Priority 49/100. High severity; Remotely exploitable, no login, no user action