CVE-2018-20721

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2018-20721
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-20721.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2018-20721
Downstream
Related
Published
2019-01-16T14:29:00.247Z
Modified
2026-04-11T21:31:32.894481Z
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

URI_FUNC() in UriParse.c in uriparser before 0.9.1 has an out-of-bounds read (in uriParseEx functions) for an incomplete URI with an IPv6 address containing an embedded IPv4 address, such as a "//[::44.1" address.

Database specific 
{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "last_affected": "8.0"
                }
            ],
            "cpe": "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
            "source": "CPE_FIELD"
        },
        {
            "extracted_events": [
                {
                    "last_affected": "9.0"
                }
            ],
            "cpe": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
            "source": "CPE_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/uriparser/uriparser

Affected ranges

Type
GIT
Repo
https://github.com/uriparser/uriparser
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f8ccdfd76b2d46b7162c17e01baee4de402947b5
Fixed
cef25028de5ff872c2e1f0a6c562eb3ea9ecbce4
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.9.1"
        }
    ],
    "cpe": "cpe:2.3:a:uriparser_project:uriparser:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_FIELD",
        "REFERENCES"
    ]
}

Affected versions

uriparser-0.*
uriparser-0.3.0
uriparser-0.3.1
uriparser-0.3.2
uriparser-0.3.3
uriparser-0.3.4
uriparser-0.4.0
uriparser-0.5.0
uriparser-0.5.1
uriparser-0.5.2
uriparser-0.6.0
uriparser-0.6.1
uriparser-0.6.2
uriparser-0.6.3
uriparser-0.6.4
uriparser-0.7.0
uriparser-0.7.1
uriparser-0.7.2
uriparser-0.7.3
uriparser-0.7.4
uriparser-0.7.5
uriparser-0.7.6
uriparser-0.7.7
uriparser-0.7.8
uriparser-0.7.9
uriparser-0.8.0
uriparser-0.8.0.1
uriparser-0.8.1
uriparser-0.8.2
uriparser-0.8.3
uriparser-0.8.4
uriparser-0.8.5
uriparser-0.8.6
uriparser-0.9.0

Database specific

vanir_signatures_modified 
"2026-04-11T21:31:32Z"
vanir_signatures 
[
    {
        "signature_version": "v1",
        "source": "https://github.com/uriparser/uriparser/commit/cef25028de5ff872c2e1f0a6c562eb3ea9ecbce4",
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "298959475600171116201057560050674086179",
                "215581821721008525431947121099457754519",
                "201805718942423830449133541022097869316",
                "260694568477623545972598510528977911363"
            ],
            "threshold": 0.9
        },
        "target": {
            "file": "src/UriParse.c"
        },
        "id": "CVE-2018-20721-4434bc5e"
    },
    {
        "signature_version": "v1",
        "source": "https://github.com/uriparser/uriparser/commit/cef25028de5ff872c2e1f0a6c562eb3ea9ecbce4",
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "338453238041534226044660422606642359923",
                "158901063685954033803528095984396445438",
                "43762078588843109887431033654435444035"
            ],
            "threshold": 0.9
        },
        "target": {
            "file": "test/test.cpp"
        },
        "id": "CVE-2018-20721-b03f06b3"
    }
]
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-20721.json"