CVE-2019-15892 [High] | Denial of Service in Varnish Cache

CVE-2019-15892 is rated Moderate Risk (60.5/100): CVSS High severity, with high exploitation likelihood (EPSS 5.90%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	7.70%	5.90%	-1.80%
2	2026-05-29	5.55%	7.70%	+2.15%
3	2025-11-21	—	5.55%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

7.70%

5.90%

-1.80%

2026-05-29

5.55%

7.70%

+2.15%

2025-11-21

—

5.55%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.0	HIGH	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]
7.8	2.0	HIGH	`AV:N/AC:L/Au:N/C:N/I:N/A:C` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:C) Complete availability impact.	10.0	6.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.0

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

[email protected]

7.8

2.0

HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:C): Complete availability impact.

10.0

6.9

[email protected]

OS Trackers for CVE-2019-15892

vendor	priority	summary	link
`alpine`	high	CVE-2019-15892: 1 source package rows (varnish); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0.	https://security.alpinelinux.org/vuln/CVE-2019-15892
`debian`	not yet assigned	CVE-2019-15892 not yet assigned priority: Debian including 1 source packages (varnish), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2019-15892
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2019-15892
`ubuntu`	medium	CVE-2019-15892 medium priority: Ubuntu including 1 source packages (varnish), 7 status rows across 7 suites (bionic, disco, eoan, focal, trusty, upstream, xenial): not-affected 4, ignored 2, released 1.	https://ubuntu.com/security/CVE-2019-15892

Affected software / configurations for CVE-2019-15892

Vendor	Product	Version	Raw CPE
varnish-software	varnish_cache	>= 6.0.0, < 6.0.4	cpe:2.3:a:varnish-software:varnish_cache:::::lts:::*
varnish_cache_project	varnish_cache	>= 6.1.0, <= 6.1.1	cpe:2.3:a:varnish_cache_project:varnish_cache::::::::
varnish_cache_project	varnish_cache	>= 6.2.0, < 6.2.1	cpe:2.3:a:varnish_cache_project:varnish_cache::::::::
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*

References for CVE-2019-15892

URL	Tags
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00069.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00089.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3OEOCYRU43TWEU2C65F3D6GK64MSWNNK/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DBAQF6UDRSTURGINIMSMLJR4PTDYWA7C/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KLSF54TDJWJLINIFEW5V5BKDNY5EQRR3/
https://seclists.org/bugtraq/2019/Sep/5	Mailing List Third Party Advisory
https://varnish-cache.org/security/VSV00003.html	Vendor Advisory
https://www.debian.org/security/2019/dsa-4514	Third Party Advisory

URL

CVE-2019-15892

Exploit prediction scoring system (EPSS) score for CVE-2019-15892

Common vulnerability scoring system (CVSS) metrics for CVE-2019-15892

Weakness enumeration for CVE-2019-15892

OS Trackers for CVE-2019-15892

Affected software / configurations for CVE-2019-15892

References for CVE-2019-15892