CVE-2017-12425
mediumpriority · track · 31EPSS 0.024 · 84 %ileEUUSEPSS · scored 2026-10-27
An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2. A wrong if statement in the varnishd source code means that particular invalid requests from the client can trigger an assert, related to an Integer Overflow. This causes the varnishd worker process to abort and restart, losing the cached contents in the process. An attacker can therefore crash the varnishd worker process on demand and effectively keep it from serving content - a Denial-of-Service attack. The specific source-code filename containing the incorrect statement varies across releases.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (20)
Products and version ranges known to be affected.
- varnish cache project varnish cache= 4.0.1nvdUScpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
- varnish cache project varnish cache= 4.0.2nvdUScpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
- varnish cache project varnish cache= 4.0.3nvdUScpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
- varnish cache project varnish cache= 4.0.4nvdUScpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
- varnish cache project varnish cache= 5.0.0nvdUScpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
- varnish cache project varnish cache= 5.1.0nvdUScpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
- varnish cache project varnish cache= 5.1.1nvdUScpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
- varnish cache project varnish cache= 5.1.2nvdUScpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (18)
External citations — patches, advisories, analysis.
- https://bugzilla.redhat.com/show_bug.cgi?id=1477222cnnvd
- https://bugzilla.suse.com/show_bug.cgi?id=1051917cnnvd
- https://github.com/varnishcache/varnish-cache/issues/2379cnnvd
- https://lists.debian.org/debian-security-announce/2017/msg00186.htmlcnnvd
- https://www.debian.org/security/2017/dsa-3924cnnvd
- https://www.varnish-cache.org/security/VSV00001.html#vsv00001cnnvd
- http://www.debian.org/security/2017/dsa-3924enisa_euvd
- https://bugzilla.redhat.com/show_bug.cgi?id=1477222enisa_euvd
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