UBUNTU-CVE-2021-33500

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Source
https://ubuntu.com/security/CVE-2021-33500
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33500.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-33500
Upstream
  • CVE-2021-33500
Published
2021-05-21T20:15:00Z
Modified
2026-01-20T17:29:29.418193Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by telling the PuTTY window to change its title repeatedly at high speed, which results in many SetWindowTextA or SetWindowTextW calls. NOTE: the same attack methodology may affect some OS-level GUIs on Linux or other platforms for similar reasons.

References

Affected packages

Ubuntu:16.04:LTS
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty@0.67-3+deb9u1build0.16.04.1?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.65-2
0.66-1
0.66-2
0.66-3
0.66-4
0.67-1
0.67-2
0.67-3build0.16.04.1
0.67-3+deb9u1build0.16.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pterm",
            "binary_version": "0.67-3+deb9u1build0.16.04.1"
        },
        {
            "binary_name": "putty",
            "binary_version": "0.67-3+deb9u1build0.16.04.1"
        },
        {
            "binary_name": "putty-tools",
            "binary_version": "0.67-3+deb9u1build0.16.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33500.json"
Ubuntu:18.04:LTS
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty@0.70-4?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.70-1
0.70-2
0.70-3
0.70-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pterm",
            "binary_version": "0.70-4"
        },
        {
            "binary_name": "putty",
            "binary_version": "0.70-4"
        },
        {
            "binary_name": "putty-tools",
            "binary_version": "0.70-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33500.json"
Ubuntu:20.04:LTS
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty@0.73-2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.72-1
0.73-1
0.73-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pterm",
            "binary_version": "0.73-2"
        },
        {
            "binary_name": "putty",
            "binary_version": "0.73-2"
        },
        {
            "binary_name": "putty-tools",
            "binary_version": "0.73-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33500.json"
Ubuntu:22.04:LTS
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty@0.76-2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.75-3
0.76-1
0.76-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pterm",
            "binary_version": "0.76-2"
        },
        {
            "binary_name": "putty",
            "binary_version": "0.76-2"
        },
        {
            "binary_name": "putty-tools",
            "binary_version": "0.76-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33500.json"
Ubuntu:24.04:LTS
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty@0.81-1?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.78-3
0.79-1
0.80-1
0.80-1build2
0.80-1build3
0.81-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pterm",
            "binary_version": "0.81-1"
        },
        {
            "binary_name": "putty",
            "binary_version": "0.81-1"
        },
        {
            "binary_name": "putty-tools",
            "binary_version": "0.81-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33500.json"
Ubuntu:25.10
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty@0.83-3?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.83-2
0.83-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "pterm",
            "binary_version": "0.83-3"
        },
        {
            "binary_name": "putty",
            "binary_version": "0.83-3"
        },
        {
            "binary_name": "putty-tools",
            "binary_version": "0.83-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33500.json"