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TI-2020-17132 Aliases CVE-2020-28196GHSA-2wgw-3mv7-47xf

MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded…

Priority MEDIUM 46CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 2 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-674.

Summary

MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.04417 91st percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 12

CPEVersionsRoleVendor
cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*before 1.17.2; 1.18.0 to before 1.18.3Vulnerablemoos-ivp
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*31VulnerableFedoraproject
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*not specified by NVDVulnerableNetApp
cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:*1.14.0VulnerableOracle
cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:*12.0.0.3.0VulnerableOracle
  • cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:* Versions before 1.17.2; 1.18.0 to before 1.18.3 Vulnerable ·moos-ivp
  • cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
  • cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
  • cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:* Versions 1.14.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:* Versions 12.0.0.3.0 Vulnerable ·Oracle
Show 2 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:oracle:communications_pricing_design_center:12.0.0.3.0:*:*:*:*:*:*:*12.0.0.3.0VulnerableOracle
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*up to 8.0.23VulnerableOracle
  • cpe:2.3:a:oracle:communications_pricing_design_center:12.0.0.3.0:*:*:*:*:*:*:* Versions 12.0.0.3.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* Versions up to 8.0.23 Vulnerable ·Oracle

Remediation

Red Hat 2 advisories

  • RHSA-2021:2239 Released 2021-06-03 · Red Hat rating Moderate
    Red Hat Virtualization Host security update [ovirt-4.4.6]
    • Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host-4.4.6-20210527.3.el8_4, redhat-virtualization-host-image-update-4.4.6-20210527.3.el8_4
  • RHSA-2021:1593 Released 2021-05-18 · Red Hat rating Moderate
    krb5 security update
    • Red Hat Enterprise Linux BaseOS (v. 8) krb5-1.18.2-8.el8, krb5-devel-1.18.2-8.el8, krb5-libs-1.18.2-8.el8 +5

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat JBoss Enterprise Web Server 2AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:1593
Red Hat Virtualization 4 Hypervisor for RHEL 8Fixed RHSA-2021:2239
Not affected: 6 products
  • RHEL 8-based RHEV-H for RHEV 4 (build requirements)
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat JBoss Core Services
  • Red Hat Virtualization 4 Hypervisor for RHEL 8
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-28196
  2. 2026-10-03 Alias added: GHSA-2wgw-3mv7-47xf

References

Patch 4

Advisory 8

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences