CVE-2021-3671

A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.

References

Affected packages

Git / github.com/heimdal/heimdal

Affected ranges

Type: GIT
Repo: https://github.com/heimdal/heimdal
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

04171147948d0a3636bc6374181926f0fb2ec83a

Type

GIT

Repo

https://github.com/samba-team/samba

Events

Introduced

Fixed

aa756f3f9fc88bbd10c6a3a7c1827ca09a669714

Introduced

9b49519cae3e967af9ea48dc5fcfb6c145e31db4

Fixed

d1c9330fa69ba6942ab23843e21acc11767d54ee

Database specific

{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.13.12"
        },
        {
            "introduced": "4.14.0"
        },
        {
            "fixed": "4.14.8"
        }
    ]
}

Affected versions

Other

git2svn-syncpoint-master

switch-from-svn-to-git

heimdal-1.*

heimdal-1.3.0pre1

heimdal-1.3.0pre10

heimdal-1.3.0pre11

heimdal-1.3.0pre3

heimdal-1.3.0pre4

heimdal-1.3.0pre5

heimdal-1.3.0pre6

heimdal-1.3.0pre7

heimdal-1.3.0pre8

heimdal-1.3.0pre9

heimdal-1.3.0rc1

heimdal-1.5pre1

heimdal-1.5pre2

ldb-1.*

ldb-1.1.0

ldb-1.1.10

ldb-1.1.11

ldb-1.1.12

ldb-1.1.13

ldb-1.1.14

ldb-1.1.15

ldb-1.1.16

ldb-1.1.17

ldb-1.1.18

ldb-1.1.19

ldb-1.1.2

ldb-1.1.20

ldb-1.1.21

ldb-1.1.22

ldb-1.1.23

ldb-1.1.25

ldb-1.1.26

ldb-1.1.27

ldb-1.1.28

ldb-1.1.29

ldb-1.1.3

ldb-1.1.30

ldb-1.1.31

ldb-1.1.4

ldb-1.1.5

ldb-1.1.6

ldb-1.1.8

ldb-1.1.9

ldb-1.2.0

ldb-1.2.1

ldb-1.2.2

ldb-1.3.0

ldb-1.3.1

ldb-1.3.2

ldb-1.4.0

ldb-1.4.1

ldb-1.5.0

ldb-1.5.1

ldb-1.5.2

ldb-1.6.1

ldb-1.6.2

ldb-1.6.3

ldb-2.*

ldb-2.0.5

ldb-2.1.0

ldb-2.1.1

ldb-2.2.0

samba-4.*

samba-4.0.0alpha10

samba-4.0.0alpha17

samba-4.0.0alpha18

samba-4.0.0alpha19

samba-4.0.0alpha20

samba-4.0.0alpha21

samba-4.0.0alpha6

samba-4.0.0alpha7

samba-4.0.0alpha8

samba-4.0.0alpha9

samba-4.0.0beta1

samba-4.0.0beta2

samba-4.0.0beta3

samba-4.0.0beta4

samba-4.0.0beta5

samba-4.0.0beta6

samba-4.0.0beta7

samba-4.0.0beta8

samba-4.0.0rc1

samba-4.10.0rc1

samba-4.11.0rc1

samba-4.12.0rc1

samba-4.13.0

samba-4.13.0rc1

samba-4.13.0rc2

samba-4.13.0rc3

samba-4.13.0rc4

samba-4.13.0rc5

samba-4.13.0rc6

samba-4.13.10

samba-4.13.11

samba-4.13.2

samba-4.13.3

samba-4.13.4

samba-4.13.5

samba-4.13.9

samba-4.14.0

samba-4.14.3

samba-4.14.5

samba-4.14.6

samba-4.14.7

samba-4.2.0rc1

samba-4.3.0rc1

samba-4.4.0rc1

samba-4.5.0rc1

samba-4.6.0rc1

samba-4.7.0rc1

samba-4.8.0rc1

samba-4.9.0rc1

talloc-1.*

talloc-1.3.1

talloc-2.*

talloc-2.0.0

talloc-2.0.7

talloc-2.0.8

talloc-2.1.0

talloc-2.1.1

talloc-2.1.10

talloc-2.1.11

talloc-2.1.12

talloc-2.1.13

talloc-2.1.14

talloc-2.1.15

talloc-2.1.16

talloc-2.1.2

talloc-2.1.3

talloc-2.1.4

talloc-2.1.5

talloc-2.1.6

talloc-2.1.7

talloc-2.1.8

talloc-2.1.9

talloc-2.2.0

talloc-2.3.0

talloc-2.3.1

tdb-1.*

tdb-1.1.5

tdb-1.2.0

tdb-1.2.1

tdb-1.2.10

tdb-1.2.11

tdb-1.2.12

tdb-1.2.13

tdb-1.3.0

tdb-1.3.1

tdb-1.3.10

tdb-1.3.11

tdb-1.3.12

tdb-1.3.13

tdb-1.3.14

tdb-1.3.15

tdb-1.3.16

tdb-1.3.17

tdb-1.3.18

tdb-1.3.2

tdb-1.3.3

tdb-1.3.4

tdb-1.3.5

tdb-1.3.6

tdb-1.3.7

tdb-1.3.8

tdb-1.3.9

tdb-1.4.0

tdb-1.4.1

tdb-1.4.2

tdb-1.4.3

tevent-0.*

tevent-0.10.0

tevent-0.10.1

tevent-0.10.2

tevent-0.9.11

tevent-0.9.12

tevent-0.9.13

tevent-0.9.14

tevent-0.9.15

tevent-0.9.16

tevent-0.9.17

tevent-0.9.18

tevent-0.9.19

tevent-0.9.20

tevent-0.9.21

tevent-0.9.22

tevent-0.9.23

tevent-0.9.24

tevent-0.9.25

tevent-0.9.26

tevent-0.9.27

tevent-0.9.28

tevent-0.9.29

tevent-0.9.30

tevent-0.9.31

tevent-0.9.32

tevent-0.9.33

tevent-0.9.34

tevent-0.9.35

tevent-0.9.36

tevent-0.9.37

tevent-0.9.38

tevent-0.9.39

tevent-0.9.8

upstream-1.*

upstream-1.4.0+git20101228.dfsg.1

upstream-1.4.0+git20110220.dfsg.1

Database specific

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "10.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "11.0"
            }
        ]
    }
]

vanir_signatures_modified

"2026-04-11T16:26:02Z"

vanir_signatures

[
    {
        "deprecated": false,
        "target": {
            "file": "kdc/krb5tgs.c"
        },
        "id": "CVE-2021-3671-5f6e87fc",
        "signature_type": "Line",
        "source": "https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "71814477620078668530731684481303091670",
                "284346098059572621942400253662874014995",
                "63355110677909982606625851675836965070",
                "200771017170665811656047669952130469804"
            ],
            "threshold": 0.9
        }
    },
    {
        "deprecated": false,
        "target": {
            "file": "kdc/krb5tgs.c",
            "function": "tgs_build_reply"
        },
        "id": "CVE-2021-3671-e212c18a",
        "signature_type": "Function",
        "source": "https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a",
        "signature_version": "v1",
        "digest": {
            "function_hash": "332444689167320886733846614105216309617",
            "length": 21025.0
        }
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3671.json"