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VULNERABILITIES

CVE-2020-28042 Details

Description

ServiceStack before 5.9.2 mishandles JWT signature verification unless an application has a custom ValidateToken function that establishes a valid minimum length for a signature.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850 CVERelease NotesVendor Advisory
https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585ee CVEPatchThird Party Advisory
https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/ CVEExploitThird Party Advisory
https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/ CVEExploitThird Party Advisory
https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850 [email protected]Release NotesVendor Advisory

see all 8 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-347Improper Verification of Cryptographic Signature[email protected]

Affected Products

ProductVersions
servicestack servicestack
< 5.9.2

CPE

  • cpe:2.3:a:servicestack:servicestack:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2020-28042
NVD Published Date:
Nov 2, 2020
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2020-28042 Details - Not Deferred