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Public proof of conceptFix available

CVE-2020-5421

A public proof of concept exists; no exploitation attested.

  • Published2020-09-19

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-09-1904:15CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub
  3. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-5421?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-5421?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Oracle retail xstore point of service
BranchAffectedFixed in
15.0= 15.0.4no fix published
16.0= 16.0.6no fix published
17.0= 17.0.4no fix published
18.0= 18.0.3no fix published
19.0= 19.0.2no fix published
Oracle weblogic server
BranchAffectedFixed in
10.3= 10.3.6.0.0no fix published
12.1= 12.1.3.0.0no fix published
12.2= 12.2.1.3.0no fix published
12.2= 12.2.1.4.0no fix published
14.1= 14.1.1.0.0no fix published
Oracle insurance policy administration
BranchAffectedFixed in
11.x≥ 11.1.0, ≤ 11.3.0no fix published
10.2= 10.2no fix published
10.2= 10.2.4no fix published
11.0= 11.0.2no fix published

35 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As pivotal, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Spring by VMware Spring Framework
    Affected
    • ≥ 4.3, < 4.3.29fixed in 4.3.29custom
    • ≥ 5.0, < 5.0.19fixed in 5.0.19custom
    • ≥ 5.1, < 5.1.18fixed in 5.1.18custom
    • ≥ 5.2, < 5.2.9fixed in 5.2.9custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-04-19

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libspring-javaUbuntu:Pro:24.04:LTSall versions · no fixed version listed
  • libspring-javaUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • libspring-javaUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • libspring-javaUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • libspring-javaUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • libspring-javaUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • libspring-javaUbuntu:26.10all versions · no fixed version listed
  • libspring-javaUbuntu:26.04:LTSall versions · no fixed version listed

20 more package ranges on OSV.dev

Vendor advisories

  • RHSA-2021:3140 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Fuse 7.9.0 release and security update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2021:3140 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. Installation instructions are available from the Fuse 7.9.0 product documentation page: https://access.redhat.com/documentation/en-us/red_hat…

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedpandaMingx/CVE-2020-5421
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N
Published
2020-09-19
Last Modified
2026-10-08
NVD status
Modified
GitHub Advisory
GHSA-rv39-3qh7-9v7w

Frequently asked questions

What is CVE-2020-5421?

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.

Is CVE-2020-5421 actively exploited?

Active exploitation of CVE-2020-5421 has not been confirmed. Its EPSS score was 11.6% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-5421?

CVE-2020-5421 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N.

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Sources for this record