USN-4966-1

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Source
https://ubuntu.com/security/notices/USN-4966-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4966-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-4966-1
Upstream
Related
Published
2021-05-25T17:00:37.860402Z
Modified
2025-10-13T04:35:30Z
Summary
libx11 vulnerability
Details

It was discovered that libx11 incorrectly validated certain parameter lengths. A remote attacker could possibly use this issue to trick libx11 into emitting extra X protocol requests.

References

Affected packages

Ubuntu:18.04:LTS / libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11@2:1.6.4-3ubuntu0.4?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:1.6.4-3ubuntu0.4

Affected versions

2:1.*

2:1.6.4-3
2:1.6.4-3ubuntu0.1
2:1.6.4-3ubuntu0.2
2:1.6.4-3ubuntu0.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libx11-6",
            "binary_version": "2:1.6.4-3ubuntu0.4"
        },
        {
            "binary_name": "libx11-data",
            "binary_version": "2:1.6.4-3ubuntu0.4"
        },
        {
            "binary_name": "libx11-dev",
            "binary_version": "2:1.6.4-3ubuntu0.4"
        },
        {
            "binary_name": "libx11-xcb-dev",
            "binary_version": "2:1.6.4-3ubuntu0.4"
        },
        {
            "binary_name": "libx11-xcb1",
            "binary_version": "2:1.6.4-3ubuntu0.4"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-31535",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4966-1.json"

Ubuntu:20.04:LTS / libx11

Package

Name
libx11
Purl
pkg:deb/ubuntu/libx11@2:1.6.9-2ubuntu1.2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:1.6.9-2ubuntu1.2

Affected versions

2:1.*

2:1.6.8-1
2:1.6.9-2
2:1.6.9-2ubuntu1
2:1.6.9-2ubuntu1.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libx11-6",
            "binary_version": "2:1.6.9-2ubuntu1.2"
        },
        {
            "binary_name": "libx11-data",
            "binary_version": "2:1.6.9-2ubuntu1.2"
        },
        {
            "binary_name": "libx11-dev",
            "binary_version": "2:1.6.9-2ubuntu1.2"
        },
        {
            "binary_name": "libx11-xcb-dev",
            "binary_version": "2:1.6.9-2ubuntu1.2"
        },
        {
            "binary_name": "libx11-xcb1",
            "binary_version": "2:1.6.9-2ubuntu1.2"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-31535",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4966-1.json"