CVE-2020-8794

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Source
https://nvd.nist.gov/vuln/detail/CVE-2020-8794
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-8794.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2020-8794
Downstream
Published
2020-02-25T17:15:13Z
Modified
2025-08-09T20:01:26Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mtaio in mtasession.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.

References

Affected packages

Debian:11 / opensmtpd

Package

Name
opensmtpd
Purl
pkg:deb/debian/opensmtpd?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.6.4p1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / opensmtpd

Package

Name
opensmtpd
Purl
pkg:deb/debian/opensmtpd?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.6.4p1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / opensmtpd

Package

Name
opensmtpd
Purl
pkg:deb/debian/opensmtpd?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.6.4p1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / opensmtpd

Package

Name
opensmtpd
Purl
pkg:deb/debian/opensmtpd?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.6.4p1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Git / github.com/opensmtpd/opensmtpd

Affected ranges

Type
GIT
Repo
https://github.com/opensmtpd/opensmtpd
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
555d2121736acdd70453b24b94c8c2996d9ab5f9

Database specific 

{
    "vanir_signatures": [
        {
            "id": "CVE-2020-8794-7da4040d",
            "deprecated": false,
            "signature_version": "v1",
            "signature_type": "Function",
            "target": {
                "file": "smtpd/queue_fs.c",
                "function": "queue_fs_envelope_create"
            },
            "digest": {
                "length": 852.0,
                "function_hash": "196875953881991152077236116624259068501"
            },
            "source": "https://github.com/opensmtpd/opensmtpd/commit/555d2121736acdd70453b24b94c8c2996d9ab5f9"
        },
        {
            "id": "CVE-2020-8794-8fca902c",
            "deprecated": false,
            "signature_version": "v1",
            "signature_type": "Line",
            "target": {
                "file": "smtpd/queue_fs.c"
            },
            "digest": {
                "threshold": 0.9,
                "line_hashes": [
                    "242575823212615086944252627364996250139",
                    "191066550062516158912985716223257094754",
                    "166787329513173112996708886338970170939",
                    "256753418468187729585530898156176574718",
                    "273979709428202467439049274088971250784"
                ]
            },
            "source": "https://github.com/opensmtpd/opensmtpd/commit/555d2121736acdd70453b24b94c8c2996d9ab5f9"
        }
    ]
}