VDB-157436 · CVE-2020-14145 · Nessus 239762

OpenSSH up to 8.3 Algorithm Negotiation information disclosure

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.
4.8	$5k-$25k	0.00

Summaryinfo

A vulnerability was found in OpenSSH up to 8.3. It has been declared as problematic. This issue affects some unknown processing of the component Algorithm Negotiation. Such manipulation leads to information disclosure. This vulnerability is documented as CVE-2020-14145. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in OpenSSH up to 8.3 (Connectivity Software). It has been rated as problematic. Affected by this issue is some unknown processing of the component Algorithm Negotiation. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.

The weakness was released 06/29/2020. This vulnerability is handled as CVE-2020-14145 since 06/15/2020. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 12/18/2025). The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 239762 (TencentOS Server 3: openssh (TSSA-2022:0215)), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the vulnerability database at Tenable (239762). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Connectivity Software

Name

OpenSSH

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
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: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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

Nessus ID: 239762
Nessus Name: TencentOS Server 3: openssh (TSSA-2022:0215)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/15/2020 🔍
06/29/2020 +14 days 🔍
06/30/2020 +1 days 🔍
12/18/2025 +1997 days 🔍

Sourcesinfo

Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-14145 (🔍)
GCVE (CVE): GCVE-0-2020-14145
GCVE (VulDB): GCVE-100-157436

Entryinfo

Created: 06/30/2020 08:43
Updated: 12/18/2025 16:32
Changes: 06/30/2020 08:43 (34), 06/30/2020 08:48 (18), 10/28/2020 06:31 (1), 06/20/2025 20:37 (17), 12/18/2025 16:32 (2)
Complete: 🔍
Cache ID: 216::103