CVE-2022-0711 [High] | Denial of Service in Haproxy

CVE-2022-0711 is rated Moderate Risk (59.5/100): CVSS High severity, with high exploitation likelihood (EPSS 66.48%, 98th 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	2025-11-21	72.39%	66.48%	-5.90%
2	2025-11-18	66.48%	72.39%	+5.90%
3	2025-08-26	—	66.48%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

72.39%

66.48%

-5.90%

2025-11-18

66.48%

72.39%

+5.90%

2025-08-26

—

66.48%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/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]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/I:N/A:P` 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:P) Partial availability impact.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/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]

5.0

2.0

MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P 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:P): Partial availability impact.

10.0

2.9

[email protected]

OS Trackers for CVE-2022-0711

vendor	priority	summary	link
`alpine`	high	CVE-2022-0711: 1 source package rows (haproxy); 4 state rows across 1 repos (3.12-main); fixed 4, open 0.	https://security.alpinelinux.org/vuln/CVE-2022-0711
`debian`	not yet assigned	CVE-2022-0711 not yet assigned priority: Debian including 1 source packages (haproxy), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2022-0711
`redhat`	high	—	https://access.redhat.com/security/cve/CVE-2022-0711
`suse`	medium	CVE-2022-0711 severity moderate: SUSE including 7 source package names (haproxy, haproxy-2.4.22+git0.f8e3218e2-150400.3.16.1, …), 24 product×package rows across 24 product lines (HPE Helion OpenStack 8, SUSE Linux Enterprise High Availability Extension 12 SP3, … (24 product lines)): Known Not Affected 15, Fixed 9.	https://www.suse.com/security/cve/CVE-2022-0711/
`ubuntu`	medium	CVE-2022-0711 medium priority: Ubuntu including 1 source packages (haproxy), 7 status rows across 7 suites (bionic, focal, impish, jammy, trusty, upstream, xenial): not-affected 3, released 2, ignored 1, needs-triage 1.	https://ubuntu.com/security/CVE-2022-0711

Affected software / configurations for CVE-2022-0711

Vendor	Product	Version	Raw CPE
haproxy	haproxy	>= 2.2.0, < 2.2.21	cpe:2.3:a:haproxy:haproxy::::::::
haproxy	haproxy	>= 2.3.0, < 2.3.18	cpe:2.3:a:haproxy:haproxy::::::::
haproxy	haproxy	>= 2.4.0, < 2.4.13	cpe:2.3:a:haproxy:haproxy::::::::
redhat	openshift_container_platform	4.0	cpe:2.3:a:redhat:openshift_container_platform:4.0:::::::*
redhat	software_collections	—	cpe:2.3:a:redhat:software_collections:-:::::::*
redhat	enterprise_linux	7.0	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
redhat	enterprise_linux	8.0	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
debian	debian_linux	11.0	cpe:2.3:o:debian:debian_linux:11.0:::::::*

References for CVE-2022-0711

URL	Tags
https://access.redhat.com/security/cve/cve-2022-0711	Third Party Advisory
https://github.com/haproxy/haproxy/commit/bfb15ab34ead85f64cd6da0e9fb418c9cd14cee8	Patch Third Party Advisory
https://www.debian.org/security/2022/dsa-5102	Third Party Advisory
https://www.mail-archive.com/haproxy%40formilux.org/msg41833.html

URL

CVE-2022-0711

Exploit prediction scoring system (EPSS) score for CVE-2022-0711

Common vulnerability scoring system (CVSS) metrics for CVE-2022-0711

Weakness enumeration for CVE-2022-0711

OS Trackers for CVE-2022-0711

Affected software / configurations for CVE-2022-0711

References for CVE-2022-0711