CVE-2023-40225

Exp

HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23, 2.5.x and 2.6.x before 2.6.15, 2.7.x before 2.7.10, and 2.8.x before 2.8.2 forwards empty Content-Length headers, violating RFC 9110 section 8.6. In uncommon cases, an HTTP/1 server behind HAProxy may interpret the payload as an extra request.

Published: 2023-08-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-40225 is rated High Exploit Risk (72.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.81%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.72% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2023-40225

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-40225

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 0.09% 1.81% +1.72%
2 2026-06-04 0.02% 0.09% +0.07%
3 2025-03-30 — 0.02% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-40225

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.2 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N 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:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.7 [email protected]

Weakness enumeration for CVE-2023-40225

OS Trackers for CVE-2023-40225

vendor priority summary link
debian not yet assigned CVE-2023-40225 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-2023-40225
redhat medium — https://access.redhat.com/security/cve/CVE-2023-40225
suse medium CVE-2023-40225 severity moderate: SUSE including 9 source package names (2.0.31.3.5.503:haproxy-2.0.31-150200.11.23.1, haproxy, …), 26 product×package rows across 26 product lines (Container ses/7.1/ceph/haproxy, HPE Helion OpenStack 8, … (26 product lines)): Fixed 17, Known Not Affected 9. https://www.suse.com/security/cve/CVE-2023-40225/
ubuntu medium CVE-2023-40225 medium priority: Ubuntu including 1 source packages (haproxy), 8 status rows across 8 suites (bionic, focal, jammy, lunar, mantic, trusty, upstream, xenial): released 5, not-affected 2, ignored 1. https://ubuntu.com/security/CVE-2023-40225

Affected software / configurations for CVE-2023-40225

Vendor Product Version Raw CPE
haproxy haproxy <= 2.0.32 cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy >= 2.2.0, <= 2.2.30 cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy >= 2.4.0, <= 2.4.23 cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy >= 2.5.0, < 2.6.15 cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy >= 2.7.0, < 2.7.10 cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
haproxy haproxy >= 2.8.0, < 2.8.2 cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*

References for CVE-2023-40225

cvelogic Threat Intelligence