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Openconnect CVE-2020-12823

CRITICAL
Classic Buffer Overflow (CWE-120)
2020-05-12 cve@mitre.org
Buffer Overflow Denial Of Service Openconnect Fedora Debian Linux Leap
9.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
CVE Published
May 12, 2020 - 18:15 nvd
CRITICAL 9.8

DescriptionNVD

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.

AnalysisAI

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. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. 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. Affected products include: Infradead Openconnect, Fedoraproject Fedora, Debian Debian Linux, Opensuse Leap.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.

More in Openconnect

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CVE-2019-16239 CRITICAL
9.8 Sep 17

process_http_response in OpenConnect before 8.05 has a Buffer Overflow when a malicious server uses HTTP chunked encodin
CVE-2012-3291 HIGH
7.8 Jun 07

Heap-based buffer overflow in OpenConnect 3.18 allows remote servers to cause a denial of service via a crafted greeting
CVE-2020-12105 MEDIUM
5.9 Apr 23

OpenConnect through 8.08 mishandles negative return values from X509_check_ function calls, which might assist attackers
CVE-2012-6128 MEDIUM
5.0 Feb 24

Multiple stack-based buffer overflows in http.c in OpenConnect before 4.08 allow remote VPN gateways to cause a denial o

Same weakness CWE-120 – Classic Buffer Overflow

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CVE-2013-1331 HIGH
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CVE-2017-15222 CRITICAL POC
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CVE-2012-2763 HIGH POC
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Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC
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CVE-2015-5119 CRITICAL POC
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CVE-2015-3113 CRITICAL POC
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CVE-2009-0927 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2017-11882 HIGH POC
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CVE-2010-3333 HIGH POC
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CVE-2020-12823 vulnerability details – vuln.today
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