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TI-2021-04354 Aliases CVE-2021-21251

ZipSlip Arbitrary File Upload

Priority MEDIUM 52CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3 there is a critical "zip slip" vulnerability. This issue may lead to arbitrary file write. The KubernetesResource REST endpoint untars user controlled data from the request body using TarUtils. TarUtils is a custom library method leveraging Apache Commons Compress. During the untar process, there are no checks in place to prevent an untarred file from traversing the file system and overriding an existing file. For a successful exploitation, the attacker requires a valid __JobToken__ which may not be possible to get without using any of the other reported vulnerabilities. But this should be considered a vulnerability in `io.onedev.commons.utils.TarUtils` since it lives in a different artifact and can affect other projects using it. This issue was addressed in 4.0.3 by validating paths in tar archive to only allow them to be in specified folder when extracted.

Why it matters now

EPSS 0.12681 96th percentileScored 2026-11-07
Fix Fixed onedev (theonedev): 4.0.3

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
theonedevonedevbefore 4.0.34.0.3Patch availableCNA
  • onedev Vendortheonedev Affected before 4.0.3 Fixed in 4.0.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:onedev_project:onedev:*:*:*:*:*:*:*:*before 4.0.3Vulnerabletheonedev
  • cpe:2.3:a:onedev_project:onedev:*:*:*:*:*:*:*:* Versions before 4.0.3 Vulnerable ·theonedev

Remediation

  • Fix · CNA onedev (theonedev) Fixed in 4.0.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21251

References

  • TI-2021-04345 Pre-Auth Unsafe Deserialization on AttachmentUploadServet CVSS 3.1CRITICAL 10.0
  • TI-2022-18585 CI/CD Docker Escape in OneDev CVSS 3.1CRITICAL 9.9
  • TI-2022-18584 Access Control Bypass in Onedev CVSS 3.1CRITICAL 9.8
  • TI-2021-04346 Pre-Auth Unsafe Deserialization on KubernetesResource CVSS 3.1CRITICAL 10.0
  • TI-2022-18587 Git Repository Disclosure in Onedev CVSS 3.1HIGH 7.5
  • TI-2021-04349 Pre-Auth Access token leak CVSS 3.1HIGH 8.6
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences