CVE-2023-0056

An uncontrolled resource consumption vulnerability was discovered in HAProxy which could crash the service. This issue could allow an authenticated remote attacker to run a specially crafted malicious server in an OpenShift cluster. The biggest impact is to availability.

Published: 2023-03-23 Last update: 2025-02-25 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-0056 is rated Low Risk (38.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.15%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-0056

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-11 0.21% 0.15% -0.06%
2 2025-11-21 0.32% 0.21% -0.11%
3 2025-11-18 — 0.32% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-0056

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/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:L)
A normal user session is enough; they don’t have to be admin.
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.
 2.8 3.6 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/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:L)
A normal user session is enough; they don’t have to be admin.
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.
 2.8 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-0056

OS Trackers for CVE-2023-0056

vendor priority summary link
debian not yet assigned CVE-2023-0056 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-2023-0056
redhat medium — https://access.redhat.com/security/cve/CVE-2023-0056
suse high CVE-2023-0056 severity important: SUSE including 8 source package names (2.0.31.3.5.391:haproxy-2.0.31-150200.11.20.1, haproxy, …), 21 product×package rows across 21 product lines (Container ses/7.1/ceph/haproxy, HPE Helion OpenStack 8, … (21 product lines)): Fixed 12, Known Not Affected 9. https://www.suse.com/security/cve/CVE-2023-0056/
ubuntu medium CVE-2023-0056 medium priority: Ubuntu including 1 source packages (haproxy), 7 status rows across 7 suites (bionic, focal, jammy, kinetic, trusty, upstream, xenial): released 3, not-affected 2, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2023-0056

Affected software / configurations for CVE-2023-0056

Vendor Product Version Raw CPE
haproxy haproxy — cpe:2.3:a:haproxy:haproxy:-:*:*:*:*:*:*:*
redhat ceph_storage 5.0 cpe:2.3:a:redhat:ceph_storage:5.0:*:*:*:*:*:*:*
redhat software_collections — cpe:2.3:a:redhat:software_collections:-:*:*:*:*:*:*:*
redhat openshift_container_platform 4.12 cpe:2.3:a:redhat:openshift_container_platform:4.12:*:*:*:*:*:*:*
redhat openshift_container_platform_for_ibm_linuxone 4.12 cpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:4.12:*:*:*:*:*:*:*
redhat openshift_container_platform_for_power 4.12 cpe:2.3:a:redhat:openshift_container_platform_for_power:4.12:*:*:*:*:*:*:*
redhat openshift_container_platform_ibm_z_systems 4.12 cpe:2.3:a:redhat:openshift_container_platform_ibm_z_systems:4.12:*:*:*:*:*:*:*
redhat openshift_container_platform 4.10 cpe:2.3:a:redhat:openshift_container_platform:4.10:*:*:*:*:*:arm64:*
redhat openshift_container_platform 4.11 cpe:2.3:a:redhat:openshift_container_platform:4.11:*:*:*:*:*:arm64:*
redhat openshift_container_platform 4.12 cpe:2.3:a:redhat:openshift_container_platform:4.12:*:*:*:*:*:arm64:*
redhat openshift_container_platform 4.10 cpe:2.3:a:redhat:openshift_container_platform:4.10:*:*:*:*:*:*:*
redhat openshift_container_platform_for_ibm_linuxone 4.10 cpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:4.10:*:*:*:*:*:*:*
redhat openshift_container_platform_for_power 4.10 cpe:2.3:a:redhat:openshift_container_platform_for_power:4.10:*:*:*:*:*:*:*
redhat openshift_container_platform_ibm_z_systems 4.10 cpe:2.3:a:redhat:openshift_container_platform_ibm_z_systems:4.10:*:*:*:*:*:*:*
redhat openshift_container_platform 4.11 cpe:2.3:a:redhat:openshift_container_platform:4.11:*:*:*:*:*:*:*
redhat openshift_container_platform_for_ibm_linuxone 4.11 cpe:2.3:a:redhat:openshift_container_platform_for_ibm_linuxone:4.11:*:*:*:*:*:*:*
redhat openshift_container_platform_for_power 4.11 cpe:2.3:a:redhat:openshift_container_platform_for_power:4.11:*:*:*:*:*:*:*
redhat openshift_container_platform_ibm_z_systems 4.11 cpe:2.3:a:redhat:openshift_container_platform_ibm_z_systems:4.11:*:*:*:*:*:*:*
fedoraproject extra_packages_for_enterprise_linux 8.0 cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:*
fedoraproject fedora 36 cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
fedoraproject fedora 37 cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*

References for CVE-2023-0056

cvelogic Threat Intelligence