PatchTheCVECVE-2017-16221: yzt is a simple file server
CVE-2017-16221 is a high-severity flaw (CVSS 7.5) affecting yzt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
yzt is a simple file server. yzt is vulnerable to a directory traversal issue, giving an attacker access to the filesystem by placing "../" in the url.
Why this priority
- High severity
- Public exploit reference
- 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 | 2.0% (top 20%) |
| CISA exploited list | No |
| Weakness | CWE-22 |
| Published | 2018-06-07 |
| 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-2017-16221?
yzt: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2017-16221 being exploited?
CVE-2017-16221 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-2017-16221 affect?
CVE-2017-16221 affects yzt. Severity is high (CVSS 7.5). yzt is a simple file server. yzt is vulnerable to a directory traversal issue, giving an attacker access to the filesystem by placing "../" in the url.
How urgent is CVE-2017-16221?
Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action