OpenConnect 8.09 gnutls.c get_cert_name Crafted Certificate buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.5$0-$5k0.00

Summaryinfo

A vulnerability was found in OpenConnect 8.09. It has been rated as critical. The affected element is the function get_cert_name of the file gnutls.c. This manipulation as part of Crafted Certificate causes buffer overflow. The identification of this vulnerability is CVE-2020-12823. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in OpenConnect 8.09 and classified as critical. Affected by this vulnerability is the function get_cert_name of the file gnutls.c. The manipulation as part of a Crafted Certificate leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted certificate data to get_cert_name in gnutls.c.

The weakness was shared 05/12/2020. This vulnerability is known as CVE-2020-12823 since 05/12/2020. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 257997 (Linux Distros Unpatched Vulnerability : CVE-2020-12823), 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 (257997). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.5

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 257997
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2020-12823

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/12/2020 🔍
05/12/2020 +0 days 🔍
05/13/2020 +1 days 🔍
08/28/2025 +1933 days 🔍

Sourcesinfo

Status: Not defined

CVE: CVE-2020-12823 (🔍)
GCVE (CVE): GCVE-0-2020-12823
GCVE (VulDB): GCVE-100-155029

Entryinfo

Created: 05/13/2020 07:09
Updated: 08/28/2025 20:12
Changes: 05/13/2020 07:09 (36), 05/13/2020 07:14 (17), 08/28/2025 20:12 (17)
Complete: 🔍
Cache ID: 216::103

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

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