CVE-2018-20750

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Source
https://cve.org/CVERecord?id=CVE-2018-20750
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20750.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2018-20750
Downstream
Related
Published
2019-01-30T18:29:00.473Z
Modified
2026-08-04T15:26:47.840544Z
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

LibVNC through 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.

Database specific 
{
    "unresolved_ranges": [
        {
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "libvnc_project:libvncserver",
            "extracted_events": [
                {
                    "fixed": "0.9.12"
                }
            ]
        },
        {
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:simatic_itc1500_firmware",
            "extracted_events": [
                {
                    "introduced": "3.0.0.0"
                },
                {
                    "fixed": "3.2.1.0"
                }
            ]
        },
        {
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:simatic_itc1500_pro_firmware",
            "extracted_events": [
                {
                    "introduced": "3.0.0.0"
                },
                {
                    "fixed": "3.2.1.0"
                }
            ]
        },
        {
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:simatic_itc1900_firmware",
            "extracted_events": [
                {
                    "introduced": "3.0.0.0"
                },
                {
                    "fixed": "3.2.1.0"
                }
            ]
        },
        {
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:simatic_itc1900_pro_firmware",
            "extracted_events": [
                {
                    "introduced": "3.0.0.0"
                },
                {
                    "fixed": "3.2.1.0"
                }
            ]
        },
        {
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:simatic_itc2200_firmware",
            "extracted_events": [
                {
                    "introduced": "3.0.0.0"
                },
                {
                    "fixed": "3.2.1.0"
                }
            ]
        },
        {
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "siemens:simatic_itc2200_pro_firmware",
            "extracted_events": [
                {
                    "introduced": "3.0.0.0"
                },
                {
                    "fixed": "3.2.1.0"
                }
            ]
        },
        {
            "source": "CPE_STRING",
            "cpes": [
                "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*"
            ],
            "vendor_product": "canonical:ubuntu_linux",
            "extracted_events": [
                {
                    "introduced": "14.04"
                },
                {
                    "last_affected": "14.04"
                },
                {
                    "introduced": "16.04"
                },
                {
                    "last_affected": "16.04"
                },
                {
                    "introduced": "16.04"
                },
                {
                    "last_affected": "16.04"
                },
                {
                    "introduced": "18.04"
                },
                {
                    "last_affected": "18.04"
                },
                {
                    "introduced": "18.10"
                },
                {
                    "last_affected": "18.10"
                }
            ]
        },
        {
            "source": "CPE_STRING",
            "cpes": [
                "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
                {
                    "introduced": "8.0"
                },
                {
                    "last_affected": "8.0"
                },
                {
                    "introduced": "9.0"
                },
                {
                    "last_affected": "9.0"
                }
            ]
        },
        {
            "source": "DESCRIPTION",
            "extracted_events": [
                {
                    "fixed": "0.9.12"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/libvnc/libvncserver

Affected ranges

Type
GIT
Repo
https://github.com/libvnc/libvncserver
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
09e8fc02f59f16e2583b34fe1a270c238bd9ffec
Database specific 
{
    "source": "REFERENCES"
}

Affected versions

LibVNCServer-0.*
LibVNCServer-0.9.10
LibVNCServer-0.9.11
LibVNCServer-0.9.12
LibVNCServer-0.9.8
LibVNCServer-0.9.9
Other
X11VNC_0_9_10
X11VNC_0_9_11
X11VNC_0_9_12
X11VNC_0_9_7
X11VNC_0_9_8
X11VNC_0_9_9
X11VNC_REL_0_9_4
X11VNC_REL_0_9_5
X11VNC_REL_0_9_6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20750.json"
vanir_signatures 
[
    {
        "source": "https://github.com/libvnc/libvncserver/commit/09e8fc02f59f16e2583b34fe1a270c238bd9ffec",
        "signature_type": "Line",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "208450598643815690107221870743096516411",
                "188468696327442976591528711100647299430",
                "339810309386704794107010451385675606359",
                "325020323779306967113667985277008054327",
                "252246010401280782980771499642649312175",
                "331557240631615908433514250914876982357",
                "326762681830792334858650571106630307146",
                "75410939976826082944537545891517174339"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2018-20750-936cab71",
        "target": {
            "file": "libvncserver/rfbserver.c"
        },
        "deprecated": false
    },
    {
        "source": "https://github.com/libvnc/libvncserver/commit/09e8fc02f59f16e2583b34fe1a270c238bd9ffec",
        "signature_type": "Function",
        "signature_version": "v1",
        "digest": {
            "function_hash": "7250474722688794593813454546579474339",
            "length": 639.0
        },
        "id": "CVE-2018-20750-a5a2e1bb",
        "target": {
            "function": "rfbProcessFileTransferReadBuffer",
            "file": "libvncserver/rfbserver.c"
        },
        "deprecated": false
    }
]
vanir_signatures_modified 
"2026-08-04T15:26:47Z"