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CVE-2024-20337

Quick assessment

Affected
Cisco Cisco Secure Client
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Secure Client是美国思科（Cisco）公司的一个用于连接虚拟专用网络的软件。 Cisco Secure Client 存在安全漏洞，该漏洞源于对用户提供的输入验证不足。可能允许未经身份验证的远程攻击者对用户进行回车换行 (CRLF) 注入攻击。

CVSS 8.2 · High EPSS 29.91% · P98
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I. Basic Information for CVE-2024-20337

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the SAML authentication process of Cisco Secure Client could allow an unauthenticated, remote attacker to conduct a carriage return line feed (CRLF) injection attack against a user. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link while establishing a VPN session. A successful exploit could allow the attacker to execute arbitrary script code in the browser or access sensitive, browser-based information, including a valid SAML token. The attacker could then use the token to establish a remote access VPN session with the privileges of the affected user. Individual hosts and services behind the VPN headend would still need additional credentials for successful access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Client 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Client是美国思科（Cisco）公司的一个用于连接虚拟专用网络的软件。 Cisco Secure Client 存在安全漏洞，该漏洞源于对用户提供的输入验证不足。可能允许未经身份验证的远程攻击者对用户进行回车换行 (CRLF) 注入攻击。
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
Cisco Cisco Secure Client 4.9.00086 -

II. Public POCs for CVE-2024-20337

# POC Description Source Link Shenlong Link
1 CVE-2024-20337 POC Cisco Secure Client CRLF RCE and unauthorized remote access to VPN sessions https://github.com/swagcraftedd/CVE-2024-20337-POC POC Details
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III. Intelligence Information for CVE-2024-20337

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Vendor Advisories for CVE-2024-20337 (1)

Same Patch Batch · Cisco · 2024-03-06 · 8 CVEs total

CVE-2024-20338 7.3 HIGH Cisco Secure Client 安全漏洞
CVE-2024-20335 6.5 MEDIUM Cisco Small Business 安全漏洞
CVE-2024-20336 6.5 MEDIUM Cisco Small Business 安全漏洞
CVE-2024-20345 6.5 MEDIUM Cisco AppDynamics Controller 安全漏洞
CVE-2024-20301 6.2 MEDIUM Cisco Duo 安全漏洞
CVE-2024-20346 5.4 MEDIUM Cisco AppDynamics Controller 安全漏洞
CVE-2024-20292 4.4 MEDIUM Cisco Duo 安全漏洞

IV. Related Vulnerabilities

Same product: Cisco Secure Client
Same vendor: Cisco
Same weakness: CWE-93

V. Comments for CVE-2024-20337

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