Home/CVE/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
CVE

CVE-2023-40225

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

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.

HIGH · CVSS 7.2 EPSS 0.00028
Act now
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
▤

Affected Products & Versions

6
haproxy<= 2.0.32
haproxy>= 2.2.0 and <= 2.2.30
haproxy>= 2.4.0 and <= 2.4.23
haproxy>= 2.5.0 and < 2.6.15
haproxy>= 2.7.0 and < 2.7.10
haproxy>= 2.8.0 and < 2.8.2
⚠

Public Exploits & PoCs

1
pocgithub.com · 2237github.com
▣

Scoring & Timeline

7.2
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Aug 2023 · 09:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

13
suse-csafopenSUSE-SU-2024:13116-1
suse-csafSUSE-SU-2023:4646-1
rhsaRHSA-2024:1142Moderate
rhsaRHSA-2024:1089Moderate
rhsaRHSA-2023:7473Moderate
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cwe.mitre.org/data/definitions/436.htmlTechnical Description
https://github.com/haproxy/haproxy/commit/6492f1f29d738457ea9f382aca54537f35f9d856Patch
https://www.haproxy.org/download/2.6/src/CHANGELOGRelease Notes
https://www.haproxy.org/download/2.7/src/CHANGELOGRelease Notes
https://www.haproxy.org/download/2.8/src/CHANGELOGRelease Notes
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