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Varnish varnish-modules before 0.17.1 allows remote attackers 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.
| Reporter | Title | Published | Views | Family All 15 |
|---|---|---|---|---|
 | CVE-2021-28543 affecting package varnish-modules 0.16.0-4 | 12 Jan 202509:15 | – | cbl_mariner |
 | CVE-2021-28543 | 16 Mar 202117:30 | – | circl |
 | Martin Blix Grydeland varnish-modules 代码问题漏洞 | 16 Mar 202100:00 | – | cnnvd |
 | CVE-2021-28543 | 16 Mar 202114:43 | – | cve |
 | CVE-2021-28543 | 16 Mar 202114:43 | – | cvelist |
 | CVE-2021-28543 | 16 Mar 202114:43 | – | debiancve |
 | EUVD-2021-15219 | 7 Oct 202500:30 | – | euvd |
 | [SECURITY] Fedora 34 Update: varnish-modules-0.17.1-1.fc34 | 22 Mar 202102:10 | – | fedora |
 | CVE-2021-28543 | 16 Mar 202115:15 | – | nvd |
 | Fedora: Security Advisory for varnish-modules (FEDORA-2021-2ad352ec70) | 22 Mar 202100:00 | – | openvas |
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02 Oct 2025 06:11Current
7High risk
Vulners AI Score7
CVSS 25
CVSS 3.14 - 7.5
EPSS0.00918