USN-8991-1

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Source
https://ubuntu.com/security/notices/USN-8991-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8991-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8991-1
Upstream
Related
Published
2026-11-03T17:37:49Z
Modified
2026-11-04T03:43:14Z
Summary
rxvt-unicode vulnerability
Details

It was discovered that rxvt-unicode incorrectly handled certain escape sequences. An attacker could possibly use this issue to execute arbitrary code if a user displayed specially crafted text in the terminal.

References

Affected packages

Ubuntu:Pro:16.04:LTS / rxvt-unicode

Package

Name
rxvt-unicode
Purl
pkg:deb/ubuntu/rxvt-unicode?arch=source&distro=esm-apps-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
9.21-1ubuntu0.1~esm1

Affected versions

9.*
9.21-1
9.21-1build1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "rxvt-unicode",
            "binary_version": "9.21-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode-256color",
            "binary_version": "9.21-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode-lite",
            "binary_version": "9.21-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode-ml",
            "binary_version": "9.21-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2021-33477",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8991-1.json"

Ubuntu:Pro:18.04:LTS / rxvt-unicode

Package

Name
rxvt-unicode
Purl
pkg:deb/ubuntu/rxvt-unicode?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
9.22-3ubuntu0.1~esm1

Affected versions

9.*
9.22-1build2
9.22-3

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "aterm",
            "binary_version": "9.22-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "aterm-ml",
            "binary_version": "9.22-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt",
            "binary_version": "1:2.7.10-7.1+urxvt9.22-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-ml",
            "binary_version": "1:2.7.10-7.1+urxvt9.22-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode",
            "binary_version": "9.22-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode-256color",
            "binary_version": "9.22-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode-lite",
            "binary_version": "9.22-3ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2021-33477",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8991-1.json"

Ubuntu:Pro:20.04:LTS / rxvt-unicode

Package

Name
rxvt-unicode
Purl
pkg:deb/ubuntu/rxvt-unicode?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
9.22-6ubuntu0.1~esm1

Affected versions

9.*
9.22-6build1
9.22-6build2
9.22-6build3

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "aterm",
            "binary_version": "9.22-6ubuntu0.1~esm1"
        },
        {
            "binary_name": "aterm-ml",
            "binary_version": "9.22-6ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt",
            "binary_version": "1:2.7.10-7.1+urxvt9.22-6ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-ml",
            "binary_version": "1:2.7.10-7.1+urxvt9.22-6ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode",
            "binary_version": "9.22-6ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode-256color",
            "binary_version": "9.22-6ubuntu0.1~esm1"
        },
        {
            "binary_name": "rxvt-unicode-lite",
            "binary_version": "9.22-6ubuntu0.1~esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2021-33477",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8991-1.json"