Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints being accessible without valid session credentials. This is dangerous for those who have exposed Zerobyte to be used outside of their internal network. A fix has been applied in both version 0.19.0 and 0.18.5. If immediate upgrade is not possible, restrict network access to the Zerobyte instance to trusted networks only using firewall rules or network segmentation. This is only a temporary mitigation; upgrading is strongly recommended.
Conclusion & alert: CVE-2025-68435 is rated Moderate Risk (44.3/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.07%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-12-18 | — | 0.07% | — |
Full EPSS history (1 record total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.1 | 3.1 | CRITICAL |
|
3.9 | 5.2 | [email protected] |
| URL | Tags |
|---|---|
| https://github.com/nicotsx/zerobyte/commit/13e080a18967705bd2b4e110e5f7693fdca1c692 | Patch |
| https://github.com/nicotsx/zerobyte/issues/161 | Issue Tracking |
| https://github.com/nicotsx/zerobyte/security/advisories/GHSA-x539-c98q-38gv | Mitigation Patch Vendor Advisory |