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Vulnerability details: VCID-9xxa-rrnt-zuaw
Vulnerability ID VCID-9xxa-rrnt-zuaw
Aliases CVE-2023-40225
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-20 Improper Input Validation
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-40225.json
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
epss 0.00032 https://api.first.org/data/v1/epss?cve=CVE-2023-40225
ssvc Track https://cwe.mitre.org/data/definitions/436.html
cvssv3.1 5.9 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
ssvc Track https://github.com/haproxy/haproxy/commit/6492f1f29d738457ea9f382aca54537f35f9d856
ssvc Track https://github.com/haproxy/haproxy/issues/2237
cvssv3.1 7.2 https://nvd.nist.gov/vuln/detail/CVE-2023-40225
ssvc Track https://www.haproxy.org/download/2.6/src/CHANGELOG
ssvc Track https://www.haproxy.org/download/2.7/src/CHANGELOG
ssvc Track https://www.haproxy.org/download/2.8/src/CHANGELOG
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-40225.json
https://api.first.org/data/v1/epss?cve=CVE-2023-40225
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-40225
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-45539
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1043502 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1043502
2231370 https://bugzilla.redhat.com/show_bug.cgi?id=2231370
2237 https://github.com/haproxy/haproxy/issues/2237
436.html https://cwe.mitre.org/data/definitions/436.html
6492f1f29d738457ea9f382aca54537f35f9d856 https://github.com/haproxy/haproxy/commit/6492f1f29d738457ea9f382aca54537f35f9d856
CHANGELOG https://www.haproxy.org/download/2.6/src/CHANGELOG
CHANGELOG https://www.haproxy.org/download/2.7/src/CHANGELOG
CHANGELOG https://www.haproxy.org/download/2.8/src/CHANGELOG
cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
CVE-2023-40225 https://nvd.nist.gov/vuln/detail/CVE-2023-40225
RHSA-2023:7473 https://access.redhat.com/errata/RHSA-2023:7473
RHSA-2023:7606 https://access.redhat.com/errata/RHSA-2023:7606
RHSA-2024:0200 https://access.redhat.com/errata/RHSA-2024:0200
RHSA-2024:0308 https://access.redhat.com/errata/RHSA-2024:0308
RHSA-2024:1089 https://access.redhat.com/errata/RHSA-2024:1089
RHSA-2024:1142 https://access.redhat.com/errata/RHSA-2024:1142
USN-6294-1 https://usn.ubuntu.com/6294-1/
USN-6294-2 https://usn.ubuntu.com/6294-2/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-40225.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-09T20:14:21Z/ Found at https://cwe.mitre.org/data/definitions/436.html
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-09T20:14:21Z/ Found at https://github.com/haproxy/haproxy/commit/6492f1f29d738457ea9f382aca54537f35f9d856
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-09T20:14:21Z/ Found at https://github.com/haproxy/haproxy/issues/2237
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2023-40225
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-09T20:14:21Z/ Found at https://www.haproxy.org/download/2.6/src/CHANGELOG
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-09T20:14:21Z/ Found at https://www.haproxy.org/download/2.7/src/CHANGELOG
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-09T20:14:21Z/ Found at https://www.haproxy.org/download/2.8/src/CHANGELOG
Exploit Prediction Scoring System (EPSS)
Percentile 0.07663
EPSS Score 0.00032
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:16:12.198119+00:00 Ubuntu USN Importer Import https://usn.ubuntu.com/6294-2/ 36.1.3