CVE-2021-28543

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Summary

CVECVE-2021-28543
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-03-16 15:15:00 UTC
Updated2023-11-07 03:32:00 UTC
DescriptionVarnish 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.

Risk And Classification

Problem Types: CWE-476 | CWE-617

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 34 All All All
Application Varnish-cache Varnish-modules All All All All
Application Varnish-cache Varnish-modules Klarlack All All All All

References

ReferenceSourceLinkTags
[SECURITY] Fedora 34 Update: varnish-modules-0.17.1-1.fc34 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
[SECURITY] Fedora 34 Update: varnish-modules-0.17.1-1.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
VSV00006 varnish-modules Denial of Service — Varnish HTTP Cache MISC varnish-cache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 281461 Fedora Security Update for varnish (FEDORA-2021-2ad352ec70)
  • 901739 Common Base Linux Mariner (CBL-Mariner) Security Update for varnish-modules (7398)
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