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Fencer Vulns
medium 6.5

CVE-2023-36054 json

lib/kadm5/kadm_rpc_xdr.c in MIT Kerberos 5 (aka krb5) before 1.20.2 and 1.21.x before 1.21.1 frees an uninitialized pointer.

published 2023-08-07 3 y ago modified 2026-07-25 3 mo ago also EUVD-2023-40036 , JLSEC-2026-92

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

lib/kadm5/kadm_rpc_xdr.c in MIT Kerberos 5 (aka krb5) before 1.20.2 and 1.21.x before 1.21.1 frees an uninitialized pointer. A remote authenticated user can trigger a kadmind crash. This occurs because _xdr_kadm5_principal_ent_rec does not validate the relationship between n_key_data and the key_data array count.

Patch / fix

  • julia Kerberos_krb5_jll 1.21.3+0
  • mit kerberos_5 1.20.2
  • krb5 Debian 12 1.20.1-2+deb12u1
  • krb5 Debian 14, Debian 13 1.20.1-3

debian advisories DEBIAN-CVE-2023-36054

  • krb5 Ubuntu 20.04 LTS 1.17-6ubuntu4.4
  • krb5 Ubuntu 22.04 LTS 1.19.2-2ubuntu0.3
  • krb5 Ubuntu Pro 14.04 LTS 1.12+dfsg-2ubuntu5.4+esm4
  • krb5 Ubuntu Pro 16.04 LTS 1.13.2+dfsg-5ubuntu2.2+esm4
  • krb5 Ubuntu Pro 18.04 LTS 1.16-2ubuntu0.4+esm1

ubuntu advisories UBUNTU-CVE-2023-36054

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • krb5 RHEL 9 1.21.1-1.el9
  • libkadm5 RHEL 9 1.21.1-1.el9
  • krb5-libs RHEL 9 1.21.1-1.el9
  • krb5-pkinit RHEL 9 1.21.1-1.el9
  • krb5-server RHEL 9 1.21.1-1.el9
  • krb5-server-ldap RHEL 9 1.21.1-1.el9
  • krb5-workstation RHEL 9 1.21.1-1.el9

red hat advisories RHSA-2023:6699

  • krb5 SLES for SAP 12 SP5, SLES 12 SP5, SLES 12 SP2-BCL +1 more 1.12.5-40.52.1
  • krb5 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +6 more 1.19.2-150300.13.1
  • krb5 SLE Module for Server Applications 15 SP4, SLE Module for Basesystem 15 SP4, SLE Micro 5.4 +4 more 1.19.2-150400.3.6.1
  • krb5 SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 1.20.1-150500.3.3.1
  • krb5 SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES 15 SP2-LTSS +3 more 1.16.3-150100.3.30.1

suse advisories SUSE-SU-2023:3434-1SUSE-SU-2023:3398-1SUSE-SU-2023:3365-1SUSE-SU-2023:3363-1SUSE-SU-2023:3325-1

  • krb5 openSUSE Tumbleweed 1.21.1-1.1

opensuse advisories openSUSE-SU-2024:13050-1

  • libkadm5 AlmaLinux 9 1.21.1-1.el9
  • krb5-libs AlmaLinux 9 1.21.1-1.el9
  • krb5-pkinit AlmaLinux 9 1.21.1-1.el9
  • krb5-server AlmaLinux 9 1.21.1-1.el9
  • krb5-server-ldap AlmaLinux 9 1.21.1-1.el9
  • krb5-workstation AlmaLinux 9 1.21.1-1.el9

almalinux advisories ALSA-2023:6699

  • krb5 Rocky Linux 9 1.21.1-10.el9_8

rocky linux advisories RLSA-2023:6699

  • krb5 Alpine 3.18, Alpine 3.17 1.20.2-r0

alpine advisories ALPINE-CVE-2023-36054

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • krb5 CBL-Mariner 2.0 1.19.4-2

azure linux advisories AZL-27874

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2023-36054 updated cvss 6.5

krb5: Denial of service through freeing uninitialized pointer

  • Red Hat JBoss Enterprise Application Platform 6 krb5
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 9) krb5-devel 1.21.1-1.el9, krb5-debuginfo 1.21.1-1.el9, krb5-debugsource 1.21.1-1.el9, libkadm5-debuginfo 1.21.1-1.el9, krb5-libs-debuginfo 1.21.1-1.el9, krb5-pkinit-debuginfo 1.21.1-1.el9, +3 more Red Hat Enterprise Linux BaseOS (v. 9) krb5 1.21.1-1.el9, libkadm5 1.21.1-1.el9, krb5-libs 1.21.1-1.el9, krb5-pkinit 1.21.1-1.el9, krb5-server 1.21.1-1.el9, krb5-server-ldap 1.21.1-1.el9, +1 more
    fixed: vendor fix RHSA-2023:6699
  • Red Hat Enterprise Linux 6 krb5, libkadm5, krb5-libs, krb5-server, krb5-server-ldap, krb5-workstation, +1 more Red Hat Enterprise Linux 7 krb5, libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, +1 more Red Hat Enterprise Linux 8 krb5, libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, +1 more
    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

cisa ICSA-24-046-11 updated cvss 6.5

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

2.81% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia Kerberos_krb5_jll
<1.21.3+0
1.21.3+0

Classification

Weakness
  • CWE-824 Access of Uninitialized Pointer

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.