CVE-2021-21242

Pre-Auth Unsafe Deserialization on AttachmentUploadServet

CRITICAL
9.8
CVSS Score
Published: January 15, 2021 at 08:05 PM UTC
Updated: June 17, 2026 at 03:35 AM UTC
2 products affected across 2 vendorsOnedevProject Onedev

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Severity
CRITICAL9.8
Exploit prediction
EPSS 74%

Description

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is a critical vulnerability which can lead to pre-auth remote code execution. AttachmentUploadServlet deserializes untrusted data from the `Attachment-Support` header. This Servlet does not enforce any authentication or authorization checks. This issue may lead to pre-auth remote code execution. This issue was fixed in 4.0.3 by removing AttachmentUploadServlet and not using deserialization

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 4.0.3
Affected range stops below 4.0.3, so it looks safe — our inference, not a vendor statement
v < 4.0.3
Affected range stops below 4.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-74CWE-502

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