Package Instance

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{
    "url": "http://public2.vulnerablecode.io/api/packages/345421?format=api",
    "purl": "pkg:apk/alpine/syncthing@1.15.1-r0?arch=armhf&distroversion=v3.21&reponame=community",
    "type": "apk",
    "namespace": "alpine",
    "name": "syncthing",
    "version": "1.15.1-r0",
    "qualifiers": {
        "arch": "armhf",
        "distroversion": "v3.21",
        "reponame": "community"
    },
    "subpath": "",
    "is_vulnerable": false,
    "next_non_vulnerable_version": null,
    "latest_non_vulnerable_version": null,
    "affected_by_vulnerabilities": [],
    "fixing_vulnerabilities": [
        {
            "url": "http://public2.vulnerablecode.io/api/vulnerabilities/101835?format=api",
            "vulnerability_id": "VCID-2g3d-77m4-qubh",
            "summary": "Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it's likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0.",
            "references": [
                {
                    "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2021-21404",
                    "reference_id": "",
                    "reference_type": "",
                    "scores": [
                        {
                            "value": "0.00251",
                            "scoring_system": "epss",
                            "scoring_elements": "0.48659",
                            "published_at": "2026-06-04T12:55:00Z"
                        }
                    ],
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-21404"
                },
                {
                    "reference_url": "https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97",
                    "reference_id": "",
                    "reference_type": "",
                    "scores": [
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                            "value": "7.5",
                            "scoring_system": "cvssv3.1",
                            "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                        },
                        {
                            "value": "LOW",
                            "scoring_system": "generic_textual",
                            "scoring_elements": ""
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                    "url": "https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"
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                {
                    "reference_url": "https://github.com/syncthing/syncthing/releases/tag/v1.15.0",
                    "reference_id": "",
                    "reference_type": "",
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                        },
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                            "value": "LOW",
                            "scoring_system": "generic_textual",
                            "scoring_elements": ""
                        }
                    ],
                    "url": "https://github.com/syncthing/syncthing/releases/tag/v1.15.0"
                },
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                    "reference_id": "",
                    "reference_type": "",
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                        },
                        {
                            "value": "LOW",
                            "scoring_system": "generic_textual",
                            "scoring_elements": ""
                        }
                    ],
                    "url": "https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h"
                },
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                    "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21404",
                    "reference_id": "",
                    "reference_type": "",
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                            "value": "7.5",
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                        },
                        {
                            "value": "LOW",
                            "scoring_system": "generic_textual",
                            "scoring_elements": ""
                        }
                    ],
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21404"
                },
                {
                    "reference_url": "https://pkg.go.dev/github.com/syncthing/syncthing",
                    "reference_id": "",
                    "reference_type": "",
                    "scores": [
                        {
                            "value": "7.5",
                            "scoring_system": "cvssv3.1",
                            "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                        },
                        {
                            "value": "LOW",
                            "scoring_system": "generic_textual",
                            "scoring_elements": ""
                        }
                    ],
                    "url": "https://pkg.go.dev/github.com/syncthing/syncthing"
                },
                {
                    "reference_url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986593",
                    "reference_id": "986593",
                    "reference_type": "",
                    "scores": [],
                    "url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=986593"
                },
                {
                    "reference_url": "https://security.archlinux.org/AVG-1778",
                    "reference_id": "AVG-1778",
                    "reference_type": "",
                    "scores": [
                        {
                            "value": "Medium",
                            "scoring_system": "archlinux",
                            "scoring_elements": ""
                        }
                    ],
                    "url": "https://security.archlinux.org/AVG-1778"
                }
            ],
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                    "purl": "pkg:apk/alpine/syncthing@1.15.1-r0?arch=armhf&distroversion=v3.21&reponame=community",
                    "is_vulnerable": false,
                    "affected_by_vulnerabilities": [],
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            "aliases": [
                "CVE-2021-21404",
                "GHSA-x462-89pf-6r5h"
            ],
            "risk_score": 3.4,
            "exploitability": "0.5",
            "weighted_severity": "6.8",
            "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-2g3d-77m4-qubh"
        }
    ],
    "risk_score": null,
    "resource_url": "http://public2.vulnerablecode.io/packages/pkg:apk/alpine/syncthing@1.15.1-r0%3Farch=armhf&distroversion=v3.21&reponame=community"
}