VDB-242045 · CVE-2023-27516 · TALOS-2023-1754

SoftEther VPN 4.41-978-beta/5.01.9674 Network Packet CiRpcAccepted variable initialization

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.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in SoftEther VPN 4.41-978-beta/5.01.9674. Affected by this issue is the function CiRpcAccepted of the component Network Packet Handler. The manipulation leads to variable initialization. This vulnerability is referenced as CVE-2023-27516. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in SoftEther VPN 4.41-978-beta/5.01.9674 (Network Encryption Software). It has been rated as problematic. This issue affects the function CiRpcAccepted of the component Network Packet Handler. The manipulation with an unknown input leads to a variable initialization vulnerability. Using CWE to declare the problem leads to CWE-453. The product, by default, initializes an internal variable with an insecure or less secure value than is possible. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An authentication bypass vulnerability exists in the CiRpcAccepted() functionality of SoftEther VPN 4.41-9782-beta and 5.01.9674. A specially crafted network packet can lead to unauthorized access. An attacker can send a network request to trigger this vulnerability.

The weakness was published 10/12/2023 as TALOS-2023-1754. The advisory is shared at talosintelligence.com. The identification of this vulnerability is CVE-2023-27516 since 06/02/2023. Technical details are known, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

Network Encryption Software

Vendor

SoftEther

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.3
CNA Vector (Talos): 🔍

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Variable initialization
CWE: CWE-453
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/02/2023 🔍
10/12/2023 +132 days 🔍
10/12/2023 +0 days 🔍
10/31/2023 +19 days 🔍

Sourcesinfo

Advisory: TALOS-2023-1754
Status: Not defined

CVE: CVE-2023-27516 (🔍)
GCVE (CVE): GCVE-0-2023-27516
GCVE (VulDB): GCVE-100-242045

Entryinfo

Created: 10/12/2023 18:29
Updated: 10/31/2023 15:38
Changes: 10/12/2023 18:29 (50), 10/31/2023 15:38 (11)
Complete: 🔍
Cache ID: 216::103