VulnerabilityModified
CVE-2020-28042
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.
MEDIUM 5.3EPSS 2.33%
Does this matter?
Lower severity and a low EPSS score (2.33%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 2.33% probability · 83th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- servicestack/servicestack
- Source
- cve@mitre.org
References
- https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850Release Notes, Vendor Advisory
- https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585eePatch, Third Party Advisory
- https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/Exploit, Third Party Advisory
- https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/Exploit, Third Party Advisory
- https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850Release Notes, Vendor Advisory
- https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585eePatch, Third Party Advisory
- https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/Exploit, Third Party Advisory
- https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.