CVE-2020-35680

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2020-35680
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35680.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2020-35680
Downstream
Published
2020-12-24T16:15:15.600Z
Modified
2026-07-09T00:22:05.779697Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

smtpd/lka_filter.c in OpenSMTPD before 6.8.0p1, in certain configurations, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer.

Database specific 
{
    "unresolved_ranges": [
        {
            "cpes": [
                "cpe:2.3:a:opensmtpd:opensmtpd:*:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "fixed": "6.8.0"
                }
            ],
            "vendor_product": "opensmtpd:opensmtpd",
            "source": "CPE_RANGE"
        },
        {
            "cpes": [
                "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
                "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "32"
                },
                {
                    "last_affected": "32"
                },
                {
                    "introduced": "33"
                },
                {
                    "last_affected": "33"
                }
            ],
            "vendor_product": "fedoraproject:fedora",
            "source": "CPE_STRING"
        },
        {
            "cpes": [
                "cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:-:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "6.8.0-NA"
                },
                {
                    "last_affected": "6.8.0-NA"
                }
            ],
            "vendor_product": "opensmtpd:opensmtpd",
            "source": "CPE_STRING"
        }
    ]
}
References

Affected packages

Git / github.com/openbsd/src

Affected ranges

Type
GIT
Repo
https://github.com/openbsd/src
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
6c3220444ed06b5796dedfd53a0f4becd903c0d1
Database specific 
{
    "source": "REFERENCES"
}

Database specific

vanir_signatures_modified 
"2026-07-09T00:22:05Z"
vanir_signatures 
[
    {
        "target": {
            "file": "usr.sbin/smtpd/lka_filter.c"
        },
        "id": "CVE-2020-35680-5a2407e5",
        "digest": {
            "line_hashes": [
                "146958479146620846539546414962359749417",
                "331739472224798831840993251905507474107",
                "91893901251692159920292890227734731430",
                "279425024596136944150789901713018609996",
                "302454195925576915379956718349724179184",
                "102226086405913718666762852662536102668",
                "156377891668464352413748805278213613186",
                "294224973442606065565798747585475670296"
            ],
            "threshold": 0.9
        },
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Line",
        "source": "https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1"
    },
    {
        "target": {
            "function": "filter_session_io",
            "file": "usr.sbin/smtpd/lka_filter.c"
        },
        "id": "CVE-2020-35680-e9b83694",
        "digest": {
            "function_hash": "139574854378595409949297631104406793897",
            "length": 477.0
        },
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Function",
        "source": "https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1"
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35680.json"

Git / github.com/opensmtpd/opensmtpd

Affected ranges

Type
GIT
Repo
https://github.com/opensmtpd/opensmtpd
Events
Introduced
b9e207ab4e42dff36a56e0b32d67f5c50e4f63fb
Last affected
b9e207ab4e42dff36a56e0b32d67f5c50e4f63fb
Database specific 
{
    "cpe": "cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:patch1-rc1:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "6.8.0-patch1\\-rc1"
        },
        {
            "last_affected": "6.8.0-patch1\\-rc1"
        }
    ],
    "source": "CPE_STRING"
}

Affected versions

6.*
6.8.0-patch1\-rc1
6.8.0p1-rc1
opensmtpd-6.*
opensmtpd-6.8.0p1-rc1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35680.json"