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Vulnerability details: VCID-db4u-nxzr-aaan
Vulnerability ID VCID-db4u-nxzr-aaan
Aliases CVE-2021-33500
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00204 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00224 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00224 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00224 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00224 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.004 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
epss 0.00778 https://api.first.org/data/v1/epss?cve=CVE-2021-33500
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-33500
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-33500
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-33500
archlinux Low https://security.archlinux.org/AVG-1978
cvssv3.1 5.9 https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
generic_textual MODERATE https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-33500
https://docs.ssh-mitm.at/puttydos.html
https://github.com/ssh-mitm/ssh-mitm-plugins/blob/main/ssh_mitm_plugins/ssh/putty_dos.py
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
AVG-1978 https://security.archlinux.org/AVG-1978
CVE-2021-33500 https://nvd.nist.gov/vuln/detail/CVE-2021-33500
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-33500
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-33500
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-33500
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.58737
EPSS Score 0.00204
Published At Nov. 1, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.