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CVE-2020-5421

MEDIUM severity · CVSS 6.5
6.5CVSS MEDIUM

Summary

In Spring Framework versions 5.2.0 - 5.2.8, 5.1.0 - 5.1.17, 5.0.0 - 5.0.18, 4.3.0 - 4.3.28, and older unsupported versions, the protections against RFD attacks from CVE-2015-5211 may be bypassed depending on the browser used through the use of a jsessionid path parameter.

Impact & exploitability

Attack vectorNetwork
Attack complexityHigh
Privileges requiredLow
User interactionRequired
Confidentiality impactLow
Integrity impactHigh
Availability impactNone
Exploit probability (EPSS)64%

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N

Affected products we track (2)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Last checked: Wed, 10 Jun 2026 22:18:30 UTC