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Vulnerability record · CVE-2017-12425 · published 4 August 2017

CVE-2017-12425: Varnish-cache varnish integer overflow vulnerability

Varnish Cache · Varnish

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.

7.5 CVSS 3.0 High EPSS 2.4% · top 16.4% CWE-190 · Integer overflow
7.5CVSS 3.0 base score, v2 5.0
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.debian.org/security/2017/dsa-3924
https://bugzilla.redhat.com/show_bug.cgi?id=1477222 Issue TrackingThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1051917 Issue TrackingThird Party Advisory
https://github.com/varnishcache/varnish-cache/issues/2379 Third Party Advisory
https://lists.debian.org/debian-security-announce/2017/msg00186.html Mailing ListThird Party Advisory
https://www.varnish-cache.org/security/VSV00001.html#vsv00001 Vendor Advisory
http://www.debian.org/security/2017/dsa-3924
https://bugzilla.redhat.com/show_bug.cgi?id=1477222 Issue TrackingThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1051917 Issue TrackingThird Party Advisory
https://github.com/varnishcache/varnish-cache/issues/2379 Third Party Advisory
https://lists.debian.org/debian-security-announce/2017/msg00186.html Mailing ListThird Party Advisory
https://www.varnish-cache.org/security/VSV00001.html#vsv00001 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-12425), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.