VDB-225472 · CVE-2023-25950 · EUVD-2023-29838

HAProxy up to 2.6.7/2.7.0 HTTP Request request smuggling

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.6	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in HAProxy up to 2.6.7/2.7.0. Impacted is an unknown function of the component HTTP Request Handler. Executing a manipulation can lead to request smuggling. This vulnerability is tracked as CVE-2023-25950. The attack can be launched remotely. No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability has been found in HAProxy up to 2.6.7/2.7.0 (Firewall Software) and classified as critical. This vulnerability affects some unknown functionality of the component HTTP Request Handler. The manipulation with an unknown input leads to a request smuggling vulnerability. The CWE definition for the vulnerability is CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate user's request. As a result, the attacker may obtain sensitive information or cause a denial-of-service (DoS) condition.

The weakness was disclosed 04/11/2023. The advisory is shared for download at git.haproxy.org. This vulnerability was named CVE-2023-25950 since 03/15/2023. There are neither technical details nor an exploit publicly available.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.haproxy.org.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-29838). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Firewall Software

Name

HAProxy

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.3
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Request smuggling
CWE: CWE-444
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 3ca4223c5e1f18a19dc93b0b09ffdbd295554d46

Timelineinfo

03/15/2023 🔍
04/11/2023 +26 days 🔍
04/11/2023 +0 days 🔍
11/03/2025 +937 days 🔍

Sourcesinfo

Advisory: git.haproxy.org
Status: Confirmed

CVE: CVE-2023-25950 (🔍)
GCVE (CVE): GCVE-0-2023-25950
GCVE (VulDB): GCVE-100-225472
EUVD: 🔍

Entryinfo

Created: 04/11/2023 12:05
Updated: 11/03/2025 10:23
Changes: 04/11/2023 12:05 (40), 04/26/2023 22:36 (1), 04/26/2023 22:48 (11), 11/03/2025 10:23 (16)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.