Vulnerability Name: | CVE-2021-28543 (CCN-198292) | ||||||||||||
Assigned: | 2021-03-16 | ||||||||||||
Published: | 2021-03-16 | ||||||||||||
Updated: | 2022-06-28 | ||||||||||||
Summary: | 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. | ||||||||||||
CVSS v3 Severity: | 7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) 6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
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CVSS v2 Severity: | 5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
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Vulnerability Type: | CWE-476 CWE-617 | ||||||||||||
Vulnerability Consequences: | Denial of Service | ||||||||||||
References: | Source: MITRE Type: CNA CVE-2021-28543 Source: XF Type: UNKNOWN varnishcache-cve202128543-dos(198292) Source: FEDORA Type: Mailing List, Third Party Advisory FEDORA-2021-2ad352ec70 Source: CCN Type: Varnish Cache VSV00006 varnish-modules Denial of Service Source: MISC Type: Vendor Advisory https://varnish-cache.org/security/VSV00006.html | ||||||||||||
Vulnerable Configuration: | Configuration 1: Configuration 2: ![]() | ||||||||||||
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