Vulnerability in Haproxy
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, 2.7.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.
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.021 (81.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/haproxy/haproxy/issues/2237 (Exploit, Issue Tracking, Vendor Advisory)
- github.com/haproxy/haproxy/commit/6492f1f29d738457ea9f382aca54537f35f9d856 (Patch)
- www.haproxy.org/download/2.8/src/CHANGELOG (Release Notes)
- www.haproxy.org/download/2.7/src/CHANGELOG (Release Notes)
- www.haproxy.org/download/2.6/src/CHANGELOG (Release Notes)
- cwe.mitre.org/data/definitions/436.html (Technical Description)
Frequently asked questions
- What is CVE-2023-40225?
- CVE-2023-40225 is a high-severity vulnerability in Haproxy, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.2/10. Published 2023-08-10.
- How severe is CVE-2023-40225?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2023-40225 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.