Answer in brief
CVE-2020-5421 records a High severity (CVSS 8.7) vulnerability in RFD Protection Bypass via jsessionid. The current sources do not mark it as known exploited. The current feed maps Spring by VMware/Spring Framework (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Spring by VMware/Spring Framework (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Spring by VMware/Spring Frameworkgeneric | >=4.3 <4.3.29 || >=5.0 <5.0.19 || >=5.1 <5.1.18 || >=5.2 <5.2.9 | 4.3.29, 5.0.19, 5.1.18, 5.2.9 |
Published upstream
Sep 19, 2020
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 8, 2026
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.
Quoted source text, attributed separately from HOL analysis.