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Fencer Intel
high 7.5

CVE-2019-15892 json

An issue was discovered in Varnish Cache before 6.0.4 LTS, and 6.1.x and 6.2.x before 6.2.1.

published 7y ago modified 4mo ago also EUVD-2019-6803

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.9%
EPSS 5.9% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

An issue was discovered in Varnish Cache before 6.0.4 LTS, and 6.1.x and 6.2.x before 6.2.1. An HTTP/1 parsing failure allows a remote attacker to trigger an assert by sending crafted HTTP/1 requests. The assert will cause an automatic restart with a clean cache, which makes it a Denial of Service attack.

Patch / fix

  • varnish-software varnish_cache 6.0.4
  • varnish_cache_project varnish_cache 6.2.1
  • varnish Debian 13, Debian 12 6.2.1-1

debian advisories DEBIAN-CVE-2019-15892

  • varnish RHEL 8 6.0.6-2.module+el8.3.0+6843+b3b42fcc
  • varnish-modules RHEL 8 0.15.0-5.module+el8.3.0+6843+b3b42fcc
  • rh-varnish6 RHEL 3 SOFTWARE_COLLECTIONS 4.1-6.el7
  • rh-varnish6-runtime RHEL 3 SOFTWARE_COLLECTIONS 4.1-6.el7
  • rh-varnish6-varnish RHEL 3 SOFTWARE_COLLECTIONS 6.0.6-1.el7
  • rh-varnish6-scldevel RHEL 3 SOFTWARE_COLLECTIONS 4.1-6.el7
  • rh-varnish6-varnish-libs RHEL 3 SOFTWARE_COLLECTIONS 6.0.6-1.el7
  • rh-varnish6-varnish-modules RHEL 3 SOFTWARE_COLLECTIONS 0.15.0-6.el7

red hat advisories RHSA-2020:4756RHEA-2020:2262

  • vinyl-cache openSUSE Tumbleweed 9.0.0-1.1
  • varnish openSUSE Tumbleweed 6.6.1-1.2
  • varnish Package Hub 15 SP1, Package Hub 15 6.2.1-bp151.4.3.1
  • varnish openSUSE Leap 15.1, openSUSE Leap 15.0 6.2.1-lp151.3.3.1

opensuse advisories openSUSE-SU-2026:10751-1openSUSE-SU-2024:11493-1openSUSE-SU-2019:2221-1openSUSE-SU-2019:2184-1

  • varnish Rocky Linux 8 6.0.6-2.module+el8.3.0+179+20b582cc
  • varnish-modules Rocky Linux 8 0.15.0-5.module+el8.3.0+179+20b582cc

rocky linux advisories RLSA-2020:4756

  • varnish Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 6.2.1-r0
  • varnish Alpine 3.8 6.0.4-r0

alpine advisories ALPINE-CVE-2019-15892

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

Is CVE-2019-15892 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2019-15892 updated cvss 7.5

varnish: denial of service handling certain crafted HTTP/1 requests

  • Red Hat Enterprise Linux AppStream (v. 8) varnish 6.0.6-2.module+el8.3.0+6843+b3b42fcc, varnish-modules 0.15.0-5.module+el8.3.0+6843+b3b42fcc
    fixed: vendor fix RHSA-2020:4756
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-varnish6 4.1-6.el7, rh-varnish6-runtime 4.1-6.el7, rh-varnish6-scldevel 4.1-6.el7, rh-varnish6-varnish 6.0.6-1.el7, rh-varnish6-varnish-libs 6.0.6-1.el7, rh-varnish6-varnish-modules 0.15.0-6.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-varnish6 4.1-6.el7, rh-varnish6-runtime 4.1-6.el7, rh-varnish6-scldevel 4.1-6.el7, rh-varnish6-varnish 6.0.6-1.el7, rh-varnish6-varnish-libs 6.0.6-1.el7, rh-varnish6-varnish-modules 0.15.0-6.el7 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-varnish6 4.1-6.el7, rh-varnish6-runtime 4.1-6.el7, rh-varnish6-scldevel 4.1-6.el7, rh-varnish6-varnish 6.0.6-1.el7, rh-varnish6-varnish-libs 6.0.6-1.el7, rh-varnish6-varnish-modules 0.15.0-6.el7 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-varnish6 4.1-6.el7, rh-varnish6-runtime 4.1-6.el7, rh-varnish6-scldevel 4.1-6.el7, rh-varnish6-varnish 6.0.6-1.el7, rh-varnish6-varnish-libs 6.0.6-1.el7, rh-varnish6-varnish-modules 0.15.0-6.el7
    fixed: vendor fix RHEA-2020:2262
  • Red Hat Software Collections rh-varnish5-varnish, rh-varnish5-varnish-libs
    not affected: vulnerable code not present

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

5.90% chance of exploitation in the next 30 days, higher than 93% 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 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness

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.