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CVE-2020-12820

Quick assessment

Affected
Fortinet FortiOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fortinet FortiOS是美国飞塔（Fortinet）公司的一套专用于FortiGate网络安全平台上的安全操作系统。该系统为用户提供防火墙、防病毒、IPSec/SSLVPN、Web内容过滤和反垃圾邮件等多种安全功能。 FortiOS SSL VPN 5.6.12及之前版本，6.0.10及之前版本中存在安全漏洞，该漏洞源于缓冲区溢出，该漏洞允许攻击者通过SSL VPN身份验证的远程攻击者使FortiClient崩溃。

CVSS 5.4 · Medium EPSS 0.89% · P58
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I. Basic Information for CVE-2020-12820

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Under non-default configuration, a stack-based buffer overflow in FortiOS version 6.0.10 and below, version 5.6.12 and below may allow a remote attacker authenticated to the SSL VPN to crash the FortiClient NAC daemon (fcnacd) and potentially execute arbitrary code via requesting a large FortiClient file name. We are not aware of proof of concept code successfully achieving the latter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Fortinet FortiOS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fortinet FortiOS是美国飞塔（Fortinet）公司的一套专用于FortiGate网络安全平台上的安全操作系统。该系统为用户提供防火墙、防病毒、IPSec/SSLVPN、Web内容过滤和反垃圾邮件等多种安全功能。 FortiOS SSL VPN 5.6.12及之前版本，6.0.10及之前版本中存在安全漏洞，该漏洞源于缓冲区溢出，该漏洞允许攻击者通过SSL VPN身份验证的远程攻击者使FortiClient崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Fortinet FortiOS 6.0.0 ~ 6.0.10 cpe:2.3:o:fortinet:fortios:6.0.10:*:*:*:*:*:*:*

II. Public POCs for CVE-2020-12820

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III. Intelligence Information for CVE-2020-12820

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Vendor Advisories for CVE-2020-12820 (1)

Same Patch Batch · Fortinet · 2024-12-19 · 7 CVEs total

CVE-2021-26102 9.8 CRITICAL Avfirewalls FortiWAN 授权问题漏洞
CVE-2020-15934 8.6 HIGH Fortinet FortiClient 安全漏洞
CVE-2021-32589 7.7 HIGH Fortinet FortiManager 和 Fortinet FortiAnalyzer 资源管理错误漏洞
CVE-2021-26115 7.6 HIGH Avfirewalls FortiWAN 操作系统命令注入漏洞
CVE-2021-26093 6.6 MEDIUM Fortinet FortiWLC 缓冲区错误漏洞
CVE-2020-12819 5.4 MEDIUM FortiOS 安全漏洞

IV. Related Vulnerabilities

Same product: FortiOS
Same vendor: Fortinet
Same weakness: CWE-121

V. Comments for CVE-2020-12820

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