In Varnish Cache 7.0.0, 7.0.1, 7.0.2, and 7.1.0, it is possible to cause the Varnish Server to assert and automatically restart through for…

published 2022-08-11 4 y ago modified 2026-09-08 2 mo ago also BIT-varnish-2022-38150 , EUVD-2022-40747

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits: 0; none known

In Varnish Cache 7.0.0, 7.0.1, 7.0.2, and 7.1.0, it is possible to cause the Varnish Server to assert and automatically restart through forged HTTP/1 backend responses. An attack uses a crafted reason phrase of the backend response status line. This is fixed in 7.0.3 and 7.1.1.

Patch / fix

fixed in 1 distros 3

bitnami varnish 7.0.1, 7.0.2, 7.0.3, 7.1.1

debian opensuse alpine

varnish Debian 13, Debian 12 7.1.1-1

debian advisories DEBIAN-CVE-2022-38150

vinyl-cache openSUSE Tumbleweed 9.0.0-1.1
varnish openSUSE Tumbleweed 7.1.1-1.1
varnish Package Hub 15 SP4, openSUSE Leap 15.4 7.1.1-bp154.2.6.1

opensuse advisories openSUSE-SU-2026:10751-1 openSUSE-SU-2024:12255-1 openSUSE-SU-2022:10104-1

varnish Alpine 3.17 7.1.1-r0
varnish Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 7.0.3-r0

alpine advisories ALPINE-CVE-2022-38150

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-2022-38150 updated 2026-11-05 cvss 7.5

varnish: denial of service via colon-starting reason phrase

Red Hat Enterprise Linux 8 varnish, varnish-modules Red Hat Enterprise Linux 9 varnish, varnish-modules Red Hat Software Collections rh-varnish6-varnish, rh-varnish6-jemalloc, rh-varnish6-varnish-libs, rh-varnish6-varnish-modules
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

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 12 mo ago (2025-10-20)

Exploit prediction

1.50% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
bitnami	varnish	>=7.0.0, <7.0.1 >=7.0.1, <7.0.2 >=7.0.2, <7.0.3 >=7.1.0, <7.1.1	7.0.1 7.0.2 7.0.3 7.1.1

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption

References

lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/V2BUKFICLZBXESLQ3MXMIG3G52RZURFK/
vendor-advisory, web
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/TW3X4PEKC5C736SCKE2UG3Y7JWKMD2K6/
vendor-advisory, web
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/M4KVVCIQVINQQ2D7ORNARSYALMJUMP3I/
vendor-advisory, web
varnish-cache.org /security/VSV00009.html
mitigation, vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2022-38150
web

Sources

Fencer Vulns 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.

Summary