Varnish varnish-modules prior to 0.17.1 allows remote malicious users to cause a denial of service (daemon restart) in some configurations. This does not affect organizations that only install the Varnish Cache product; however, it is common to install both Varnish Cache and varnish-modules. Specifically, an assertion failure or NULL pointer dereference can be triggered in Varnish Cache through the varnish-modules header.append() and header.copy() functions. For some Varnish Configuration Language (VCL) files, this gives remote clients an opportunity to cause a Varnish Cache restart. A restart reduces overall availability and performance due to an increased number of cache misses, and may cause higher load on backend servers.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
varnish-cache varnish-modules |
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varnish-cache varnish-modules klarlack |
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fedoraproject fedora 34 |
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