USN-4906-1

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Source
https://ubuntu.com/security/notices/USN-4906-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4906-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4906-1
Upstream
Related
Published
2021-04-13T15:00:11.325817Z
Modified
2025-10-13T04:35:26Z
Summary
nettle vulnerability
Details

It was discovered that Nettle incorrectly handled signature verification. A remote attacker could use this issue to cause Nettle to crash, resulting in a denial of service, or possibly force invalid signatures.

References

Affected packages

Ubuntu:16.04:LTS / nettle

Package

Name
nettle
Purl
pkg:deb/ubuntu/nettle@3.2-1ubuntu0.16.04.2?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.2-1ubuntu0.16.04.2

Affected versions

3.*

3.1.1-4
3.2-1
3.2-1ubuntu0.16.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libhogweed4",
            "binary_version": "3.2-1ubuntu0.16.04.2"
        },
        {
            "binary_name": "libnettle6",
            "binary_version": "3.2-1ubuntu0.16.04.2"
        },
        {
            "binary_name": "nettle-bin",
            "binary_version": "3.2-1ubuntu0.16.04.2"
        },
        {
            "binary_name": "nettle-dev",
            "binary_version": "3.2-1ubuntu0.16.04.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2021-20305",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:16.04:LTS"
}

Ubuntu:18.04:LTS / nettle

Package

Name
nettle
Purl
pkg:deb/ubuntu/nettle@3.4-1ubuntu0.1?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.4-1ubuntu0.1

Affected versions

3.*

3.3-2
3.4-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libhogweed4",
            "binary_version": "3.4-1ubuntu0.1"
        },
        {
            "binary_name": "libnettle6",
            "binary_version": "3.4-1ubuntu0.1"
        },
        {
            "binary_name": "nettle-bin",
            "binary_version": "3.4-1ubuntu0.1"
        },
        {
            "binary_name": "nettle-dev",
            "binary_version": "3.4-1ubuntu0.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2021-20305",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:18.04:LTS"
}

Ubuntu:20.04:LTS / nettle

Package

Name
nettle
Purl
pkg:deb/ubuntu/nettle@3.5.1+really3.5.1-2ubuntu0.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.5.1+really3.5.1-2ubuntu0.1

Affected versions

3.*

3.4.1-1
3.5.1+really3.5.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libhogweed5",
            "binary_version": "3.5.1+really3.5.1-2ubuntu0.1"
        },
        {
            "binary_name": "libnettle7",
            "binary_version": "3.5.1+really3.5.1-2ubuntu0.1"
        },
        {
            "binary_name": "nettle-bin",
            "binary_version": "3.5.1+really3.5.1-2ubuntu0.1"
        },
        {
            "binary_name": "nettle-dev",
            "binary_version": "3.5.1+really3.5.1-2ubuntu0.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2021-20305",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:20.04:LTS"
}