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Fencer Intel
high 7.5

CVE-2017-12425 json

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.

published 2017-08-04 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-3998

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

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.

Patch / fix

  • varnish Debian 13, Debian 12 5.0.0-7.1

debian advisories DEBIAN-CVE-2017-12425

  • varnish Ubuntu 16.04 LTS 4.1.1-1ubuntu0.2

ubuntu advisories UBUNTU-CVE-2017-12425

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • varnish Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 5.1.3-r0
  • varnish Alpine 3.3 4.1.2-r2
  • varnish Alpine 3.4 4.1.2-r4
  • varnish Alpine 3.6, Alpine 3.5 4.1.3-r1

alpine advisories ALPINE-CVE-2017-12425

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-12425 updated cvss 5.3

varnish: Missing check for integer overflow when handling chunk sizes in HTTP requests

  • Red Hat Software Collections rh-varnish4-varnish, rh-varnish4-varnish-libs, rh-varnish4-varnish-selinux
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.42% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.