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CVE-2025-68435

Nicotsx Zerobyte authentication bypass

9.1 CRITICALEPSS 0.41%
  1. Published17 Dec 2025

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Nicotsx Zerobyte< 0.18.5 · 0.19.0

Remediation

Fixed in
Nicotsx Zerobyte≥ 0.18.5

References

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Frequently asked

Is CVE-2025-68435 being actively exploited?

CVE-2025-68435 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.41%.

How severe is CVE-2025-68435?

CVE-2025-68435 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.41% probability of exploitation.

Which products are affected by CVE-2025-68435?

Affected products include Nicotsx Zerobyte.

How do I fix CVE-2025-68435?

Upgrade affected software to a fixed version, for example Nicotsx Zerobyte 0.18.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-68435 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.