------------------------------------------------------------------------- Debian LTS Advisory DLA-4187-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Markus Koschany May 28, 2025 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : varnish Version : 6.5.1-1+deb11u5 CVE ID : CVE-2025-47905 A client-side desync vulnerability can be triggered in Varnish, a high-performance web accelerator. An attacker can abuse a flaw in Varnish’s handling of chunked transfer encoding which allows certain malformed HTTP/1 requests to exploit improper framing of the message body to smuggle additional requests. Specifically, Varnish incorrectly permits CRLF to be skipped to delimit chunk boundaries. For Debian 11 bullseye, this problem has been fixed in version 6.5.1-1+deb11u5. We recommend that you upgrade your varnish packages. For the detailed security status of varnish please refer to its security tracker page at: https://security-tracker.debian.org/tracker/varnish Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS
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