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CVE-2021-42757

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。 Fortinet FortiOS 存在安全漏洞，该漏洞源于FortiOS 6.4.7 和 FortiOS 7.0.0 到 7.0.2 之前的 TFTP 客户端库中的缓冲区溢出 [CWE-121] 可能允许经过身份验证的本地攻击者通过特制的命令行参数实现任意代码执行。

CVSS 6.3 · Medium EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2021-42757

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A buffer overflow [CWE-121] in the TFTP client library of FortiOS before 6.4.7 and FortiOS 7.0.0 through 7.0.2, may allow an authenticated local attacker to achieve arbitrary code execution via specially crafted command line arguments.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
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。 Fortinet FortiOS 存在安全漏洞，该漏洞源于FortiOS 6.4.7 和 FortiOS 7.0.0 到 7.0.2 之前的 TFTP 客户端库中的缓冲区溢出 [CWE-121] 可能允许经过身份验证的本地攻击者通过特制的命令行参数实现任意代码执行。
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 7.0.0 ~ 7.0.2 cpe:2.3:o:fortinet:fortios:7.0.2:*:*:*:*:*:*:*
Fortinet FortiDDoS-F 6.4.0 ~ 6.4.1 cpe:2.3:o:fortinet:fortiddos-f:6.4.1:*:*:*:*:*:*:*
Fortinet FortiVoice 6.4.0 ~ 6.4.4 cpe:2.3:a:fortinet:fortivoice:6.4.4:*:*:*:*:*:*:*
Fortinet FortiProxy 7.0.0 ~ 7.0.1 -
Fortinet FortiRecorder 6.4.0 ~ 6.4.2 cpe:2.3:a:fortinet:fortirecorder:6.4.2:*:*:*:*:*:*:*
Fortinet FortiPortal 6.0.0 ~ 6.0.10 cpe:2.3:a:fortinet:fortiportal:6.0.10:*:*:*:*:*:*:*
Fortinet FortiMail 7.0.0 ~ 7.0.2 cpe:2.3:a:fortinet:fortimail:7.0.2:*:*:*:*:*:*:*
Fortinet FortiAnalyzer 7.0.0 ~ 7.0.2 cpe:2.3:o:fortinet:fortianalyzer:7.0.2:*:*:*:*:*:*:*
Fortinet FortiNDR 1.5.0 ~ 1.5.2 -
Fortinet FortiDDoS 5.5.0 ~ 5.5.1 cpe:2.3:o:fortinet:fortiddos:5.5.1:*:*:*:*:*:*:*
Fortinet FortiSwitch 7.0.0 ~ 7.0.3 cpe:2.3:a:fortinet:fortiswitch:7.0.3:*:*:*:*:*:*:*
Fortinet FortiADC 6.2.0 ~ 6.2.2 cpe:2.3:h:fortinet:fortiadc:6.2.2:*:*:*:*:*:*:*
Fortinet FortiWeb 6.4.0 ~ 6.4.1 -
Fortinet FortiManager 7.0.0 ~ 7.0.2 cpe:2.3:o:fortinet:fortimanager:7.0.2:*:*:*:*:*:*:*

II. Public POCs for CVE-2021-42757

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III. Intelligence Information for CVE-2021-42757

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Vendor Advisories for CVE-2021-42757 (1)

Same Patch Batch · Fortinet · 2021-12-08 · 28 CVEs total

CVE-2021-41017 8.8 HIGH Fortinet FortiWeb 缓冲区错误漏洞
CVE-2021-42758 8.8 HIGH Fortinet FortiWLC 访问控制错误漏洞
CVE-2021-42760 8.8 HIGH Fortinet FortiWLM SQL注入漏洞
CVE-2021-43067 8.3 HIGH Fortinet FortiAuthenticator 信息泄露漏洞
CVE-2021-36180 8.1 HIGH Fortinet FortiWeb 操作系统命令注入漏洞
CVE-2021-26109 8.1 HIGH Fortinet FortiOS 输入验证错误漏洞
CVE-2021-36173 8.0 HIGH Fortinet FortiOS 缓冲区错误漏洞
CVE-2021-26110 7.8 HIGH Fortinet FortiOS 安全漏洞
CVE-2021-41021 7.8 HIGH Fortinet FortiNAC 安全漏洞
CVE-2021-41024 7.5 HIGH Fortinet FortiOS 路径遍历漏洞
CVE-2021-41014 7.5 HIGH Fortinet FortiWeb 资源管理错误漏洞
CVE-2021-26108 7.5 HIGH Fortinet FortiOS 信任管理问题漏洞
CVE-2021-41025 7.3 HIGH Fortinet FortiWeb 竞争条件问题漏洞
CVE-2021-41027 7.3 HIGH Fortinet FortiWeb 缓冲区错误漏洞
CVE-2021-41029 6.4 MEDIUM Fortinet FortiWLM 跨站脚本漏洞
CVE-2021-26103 6.3 MEDIUM Fortinet FortiProxy SSL VPN 数据伪造问题漏洞
CVE-2021-41015 6.1 MEDIUM Fortinet FortiWeb跨站脚本漏洞
CVE-2021-43063 6.1 MEDIUM Fortinet FortiWeb 跨站脚本漏洞
CVE-2021-36188 6.1 MEDIUM Fortinet FortiWeb 跨站脚本漏洞
CVE-2021-36190 5.5 MEDIUM Fortinet FortiWeb安全漏洞

Showing top 20 of 28 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: FortiOS
Same vendor: Fortinet
Same weakness: CWE-120

V. Comments for CVE-2021-42757

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