DescriptionVarnish Cache before 7.3.2 and 7.4.x before 7.4.3 (and before 6.0.13 LTS), and Varnish Enterprise 6 before 6.0.12r6, allows credits exhaustion for an HTTP/2 connection control flow window, aka a Broke Window Attack.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1068455

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
varnish (PTS)buster6.1.1-1+deb10u3vulnerable
buster (security)6.1.1-1+deb10u4vulnerable
bullseye (security), bullseye6.5.1-1+deb11u3vulnerable
sid, trixie7.1.1-1.2vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[bookworm] - varnish <ignored> (Minor issue, too intrusive to backport)
[bullseye] - varnish <ignored> (Minor issue, too intrusive to backport) (varnish-7.5.0) (varnish-7.5.0) (varnish-7.5.0) (varnish-7.5.0) (varnish-7.5.0) (varnish-7.5.0) (varnish-7.5.0)

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