CVE-2021-33500

Name	CVE-2021-33500
Description	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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
putty (PTS)	jessie, jessie (lts)	0.63-10+deb8u2	fixed
	stretch (security), stretch (lts), stretch	0.67-3+deb9u1	fixed
	buster (security), buster, buster (lts)	0.74-1+deb11u1~deb10u2	fixed
	bullseye	0.74-1+deb11u2	fixed
	bullseye (security)	0.74-1+deb11u1	fixed
	bookworm	0.78-2+deb12u2	fixed
	bookworm (security)	0.78-2+deb12u1	fixed
	sid, trixie	0.81-3	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
putty	source	(unstable)	(not affected)

- putty <not-affected> (Windows-specific)