CVE-2023-25725

haproxy: request smuggling attack in HTTP/1 header parsing

Published Feb 14, 2023 CVSS 3.1 · 9.1 Critical EPSS 5.5% KEV · Not listed
Description
HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headers disappear before being parsed and processed, as if they had not been sent by the client. The fixed versions are 2.7.3, 2.6.9, 2.5.12, 2.4.22, 2.2.29, and 2.0.31.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-3318-1 haproxy security update
Debian DSA Debian DSA DSA-5348-1 haproxy security update
Ubuntu USN Ubuntu USN USN-5869-1 HAProxy vulnerability
Ubuntu USN Ubuntu USN USN-7135-1 HAProxy vulnerability
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Mar 20, 2025, 7:14 PM
Reserved
Feb 13, 2023, 12:00 AM
Status
Modified
Published
Feb 14, 2023, 7:15 PM
Modified
Jun 17, 2026, 5:41 AM
Severity
Important
Public date
Feb 14, 2023, 4:20 PM