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Fencer Vulns
high 7.5

CVE-2020-10758 json

Allocation of Resources Without Limits or Throttling in Keycloak

published 2020-09-16 6 y ago modified 2026-06-17 4 mo ago also GHSA-52rg-hpwq-qp56 , EUVD-2022-0825

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

A vulnerability was found in Keycloak before 11.0.1 where DoS attack is possible by sending twenty requests simultaneously to the specified keycloak server, all with a Content-Length header value that exceeds the actual byte count of the request body.

Patch / fix

  • maven org.keycloak:keycloak-parent 11.0.1
  • redhat keycloak 11.0.1
  • rh-sso7-keycloak red hat single sign on 7 9.0.5-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.5-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak red hat single sign on 7 9.0.5-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.5-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak red hat single sign on 7 9.0.5-1.redhat_00001.1.el6sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.5-1.redhat_00001.1.el6sso

red hat advisories RHSA-2020:3497RHSA-2020:3496RHSA-2020:3495

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10758 updated cvss 7.5

keycloak: DoS by sending multiple simultaneous requests with a Content-Length header value greater than actual byte count of request body

  • Red Hat OpenShift Application Runtimes keycloak keycloak
    affected: workaround, no fix available
  • Red Hat Single Sign-On 7.4 for RHEL 6 Server rh-sso7-keycloak 9.0.5-1.redhat_00001.1.el6sso, rh-sso7-keycloak-server 9.0.5-1.redhat_00001.1.el6sso
    fixed: vendor fix RHSA-2020:3495
  • Red Hat Single Sign-On 7.4 for RHEL 7 Server rh-sso7-keycloak 9.0.5-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server 9.0.5-1.redhat_00001.1.el7sso
    fixed: vendor fix RHSA-2020:3496
  • Red Hat Single Sign-On 7.4 for RHEL 8 rh-sso7-keycloak 9.0.5-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server 9.0.5-1.redhat_00001.1.el8sso
    fixed: vendor fix RHSA-2020:3497
  • Red Hat Single Sign-On 7.4.2
    fixed: vendor fix RHSA-2020:3501
  • Red Hat Text-Only RHOAR
    fixed: vendor fix RHSA-2020:3539
  • Red Hat Decision Manager 7 keycloak keycloak Red Hat Fuse 7 keycloak keycloak Red Hat Process Automation 7 keycloak keycloak Red Hat support for Spring Boot keycloak keycloak
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.95% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-parent
<11.0.1
11.0.1

Affected products

  • n/a Keycloak

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.