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Vulnerability details: VCID-yseg-9x35-4kfk
Vulnerability ID VCID-yseg-9x35-4kfk
Aliases CVE-2020-28196
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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-674 Uncontrolled Recursion
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-28196.json
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00278 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
epss 0.00378 https://api.first.org/data/v1/epss?cve=CVE-2020-28196
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2020-28196
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-28196
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-28196.json
https://api.first.org/data/v1/epss?cve=CVE-2020-28196
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28196
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfd
https://lists.debian.org/debian-lts-announce/2020/11/msg00011.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/45KKOZQWIIIW5C45PJVGQ32AXBSYNBE7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/73IGOG6CZAVMVNS4GGRMOLOZ7B6QVA7F/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KPH2V3WSQTELROZK3GFCPQDOFLKIZ6H5/
https://security.gentoo.org/glsa/202011-17
https://security.netapp.com/advisory/ntap-20201202-0001/
https://www.debian.org/security/2020/dsa-4795
https://www.oracle.com/security-alerts/cpuApr2021.html
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.oracle.com//security-alerts/cpujul2021.html
1901041 https://bugzilla.redhat.com/show_bug.cgi?id=1901041
973880 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=973880
cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:windows:*:*
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_pricing_design_center:12.0.0.3.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_pricing_design_center:12.0.0.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
CVE-2020-28196 https://nvd.nist.gov/vuln/detail/CVE-2020-28196
RHSA-2021:1593 https://access.redhat.com/errata/RHSA-2021:1593
RHSA-2021:2239 https://access.redhat.com/errata/RHSA-2021:2239
USN-4635-1 https://usn.ubuntu.com/4635-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-28196.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-28196
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-28196
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.50896
EPSS Score 0.00278
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:34:37.249398+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/4635-1/ 37.0.0