CVE-2016-6515

The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.

Database specific

{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "last_affected": "7.2"
                }
            ],
            "cpes": [
                "cpe:2.3:a:openbsd:openssh:*:p2:*:*:*:*:*:*"
            ],
            "vendor_product": "openbsd:openssh",
            "source": "CPE_RANGE"
        },
        {
            "extracted_events": [
                {
                    "last_affected": "24"
                }
            ],
            "cpes": [
                "cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "source": "CPE_STRING"
        }
    ]
}

References

Affected packages

Git / github.com/openssh/openssh-portable

Affected ranges

Type

GIT

Repo

https://github.com/openssh/openssh-portable

Events

Introduced

Fixed

99522ba7ec6963a05c04a156bf20e3ba3605987c

Fixed

fcd135c9df440bcd2d5870405ad3311743d78d97

Database specific

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "7.3"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

Other

ABOUT_TO_ADD_INET_ATON

AFTER_FREEBSD_PAM_MERGE

AFTER_KRB5_GSSAPI_MERGE

BEFORE_FREEBSD_PAM_MERGE

BEFORE_KRB5_GSSAPI_MERGE

POST_KRB4_REMOVAL

PRE-REORDER

PRE_CYGWIN_MERGE

PRE_DAN_PATCH_MERGE

PRE_FIXPATHS_INTEGRATION

PRE_HPUX_INTEGRATION

PRE_IPV6

PRE_KRB4_REMOVAL

PRE_NEW_LOGIN_CODE

PRE_SW_KRBV

V_1_2PRE17

V_1_2_1_PRE18

V_1_2_1_PRE19

V_1_2_1_PRE20

V_1_2_1_PRE21

V_1_2_1_PRE22

V_1_2_1_PRE23

V_1_2_1_PRE24

V_1_2_1_PRE25

V_1_2_1_PRE26

V_1_2_1_PRE27

V_1_2_2

V_1_2_2_P1

V_1_2_2_PRE28

V_1_2_2_PRE29

V_1_2_3

V_1_2_3_PRE1

V_1_2_3_PRE2

V_1_2_3_PRE3

V_1_2_3_PRE4

V_1_2_3_PRE5

V_1_2_3_TEST1

V_1_2_3_TEST2

V_1_2_3_TEST3

V_1_2_PRE10

V_1_2_PRE11

V_1_2_PRE12

V_1_2_PRE13

V_1_2_PRE14

V_1_2_PRE15

V_1_2_PRE16

V_1_2_PRE4

V_1_2_PRE5

V_1_2_PRE6

V_1_2_PRE7

V_1_2_PRE8

V_1_2_PRE9

V_2_0_0_BETA1

V_2_0_0_BETA2

V_2_0_0_TEST1

V_2_1_0

V_2_1_0_P1

V_2_1_0_P2

V_2_1_0_P3

V_2_1_1_P1

V_2_1_1_P2

V_2_1_1_P3

V_2_1_1_P4

V_2_2_0_P1

V_2_3_0_P1

V_2_5_0_P1

V_2_5_1_P1

V_2_5_1_P2

V_2_5_2_P1

V_3_0_1_P1

V_3_0_P1

V_3_1_P1

V_3_2_2_P1

V_3_4_P1

V_3_6_1_P1

V_3_8_P1

V_3_9_P1

V_4_2_P1

V_5_0_P1

V_5_1_P1

V_5_2_P1

V_5_5_P1

V_5_7_P1

V_6_0_P1

V_6_1_P1

V_6_2_P1

V_6_5_P1

V_6_6_P1

V_6_8_P1

V_6_9_P1

V_7_0_P1

V_7_1_P1

V_7_2_P1

Database specific

vanir_signatures

[
    {
        "digest": {
            "function_hash": "226840948738846026054403909505423905859",
            "length": 1046.0
        },
        "id": "CVE-2016-6515-a7ac801a",
        "signature_version": "v1",
        "target": {
            "file": "auth-passwd.c",
            "function": "auth_password"
        },
        "deprecated": false,
        "signature_type": "Function",
        "source": "https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97"
    },
    {
        "digest": {
            "line_hashes": [
                "169366794320422204000709960000445355030",
                "311121508538256338473633648009588614623",
                "210215936786631902887231947746032519312",
                "145147796172036403093771438374944323202",
                "34022028665672401654215887975195649129",
                "13648517431284205482544467659725921705",
                "194613709597506156553679113958316693368"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2016-6515-f74bc6a0",
        "signature_version": "v1",
        "target": {
            "file": "auth-passwd.c"
        },
        "deprecated": false,
        "signature_type": "Line",
        "source": "https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97"
    }
]

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2016-6515.json"

vanir_signatures_modified

"2026-05-30T08:51:30Z"