CVE-2024-45506

HAProxy 2.9.x before 2.9.10, 3.0.x before 3.0.4, and 3.1.x through 3.1-dev6 allows a remote denial of service for HTTP/2 zero-copy forwarding (h2_send loop) under a certain set of conditions, as exploited in the wild in 2024.

Published: 2024-09-04 Last update: 2025-03-14 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-45506 is rated Moderate Risk (52.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.21%). Review affected assets and schedule remediation.

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-2024-45506

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 2026-06-15 1.49% 1.21% -0.28%
2 2026-01-13 0.56% 1.49% +0.94%
3 2026-01-11 — 0.56% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-45506

CVSS metrics for this CVE.

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]
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 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-45506

OS Trackers for CVE-2024-45506

vendor priority summary link
debian unimportant CVE-2024-45506 unimportant 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-2024-45506
redhat high — https://access.redhat.com/security/cve/CVE-2024-45506
ubuntu medium CVE-2024-45506 medium priority: Ubuntu including 1 source packages (haproxy), 6 status rows across 6 suites (bionic, focal, jammy, noble, upstream, xenial): not-affected 5, released 1. https://ubuntu.com/security/CVE-2024-45506

Affected software / configurations for CVE-2024-45506

Vendor Product Version Raw CPE
haproxy haproxy >= 2.9.0, < 2.9.10 cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy >= 3.0.0, < 3.0.4 cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy 3.1 cpe:2.3:a:haproxy:haproxy:3.1:dev0:*:*:*:*:*:*
haproxy haproxy 3.1 cpe:2.3:a:haproxy:haproxy:3.1:dev1:*:*:*:*:*:*
haproxy haproxy 3.1 cpe:2.3:a:haproxy:haproxy:3.1:dev2:*:*:*:*:*:*
haproxy haproxy 3.1 cpe:2.3:a:haproxy:haproxy:3.1:dev3:*:*:*:*:*:*
haproxy haproxy 3.1 cpe:2.3:a:haproxy:haproxy:3.1:dev4:*:*:*:*:*:*
haproxy haproxy 3.1 cpe:2.3:a:haproxy:haproxy:3.1:dev5:*:*:*:*:*:*

References for CVE-2024-45506

cvelogic Threat Intelligence