VDB-244989 · CVE-2023-46849 · EUVD-2023-51015

OpenVPN/OpenVPN Access Server prior 2.6.7 Fragment divide by zero

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.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in OpenVPN and OpenVPN Access Server and classified as problematic. This affects an unknown function of the component Fragment Handler. Performing a manipulation results in divide by zero. This vulnerability is cataloged as CVE-2023-46849. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in OpenVPN and OpenVPN Access Server (Network Encryption Software). This affects an unknown part of the component Fragment Handler. The manipulation with an unknown input leads to a divide by zero vulnerability. CWE is classifying the issue as CWE-369. The product divides a value by zero. This is going to have an impact on availability. The summary by CVE is:

Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker to trigger a divide by zero behaviour which could cause an application crash, leading to a denial of service.

The weakness was shared 11/11/2023. The advisory is shared at openvpn.net. This vulnerability is uniquely identified as CVE-2023-46849 since 10/27/2023. Neither technical details nor an exploit are publicly available.

Upgrading to version 2.6.7 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-51015). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Network Encryption Software

Name

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Divide by zero
CWE: CWE-369 / CWE-404
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: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenVPN/OpenVPN Access Server 2.6.7

Timelineinfo

10/27/2023 🔍
11/11/2023 +15 days 🔍
11/11/2023 +0 days 🔍
05/07/2026 +908 days 🔍

Sourcesinfo

Advisory: FEDORA-2023-d9d55a0bfc
Status: Confirmed

CVE: CVE-2023-46849 (🔍)
GCVE (CVE): GCVE-0-2023-46849
GCVE (VulDB): GCVE-100-244989
EUVD: 🔍

Entryinfo

Created: 11/11/2023 07:58
Updated: 05/07/2026 13:54
Changes: 11/11/2023 07:58 (37), 12/06/2023 11:31 (1), 12/06/2023 11:39 (11), 06/11/2025 17:29 (16), 06/11/2025 17:52 (1), 05/07/2026 13:51 (2), 05/07/2026 13:54 (4)
Complete: 🔍
Committer: lywand
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.