CVE-2024-20337

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.

Scoring

Severity

HIGH

CVSS base score

8.2

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

EPSS probability

31.02%

CWE

CWE-93

Published

2024-03-06

Last modified

2026-03-13

Affected products

• Cisco Cisco Secure Client
• Cisco Cisco Secure Client
• Cisco Cisco Secure Client
• Cisco Cisco Secure Client
• Cisco Cisco Secure Client
• Cisco Cisco Secure Client
• Cisco Cisco Secure Client
• Cisco Cisco Secure Client

Weakness type

• CWE-93

Related vulnerabilities

• CVE-2026-48019 — CRLF injection in Laravel's default email rule enables SMTP smuggling and spoofed-mail relay
• CVE-2026-75925 — IXON VPN Client CRLF Injection
• CVE-2026-84962 — Authenticated KMS request forgery via CRLF injection in GCP key identifier strings
• CVE-2026-84379 — HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers
• CVE-2026-84372 — Predis: Redis command injection and denial of service via CRLF smuggling in pipelined commands on aggregate connections
• CVE-2026-82854 — Nodemailer before 8.0.3 SMTP Command Injection via envelope.size
• CVE-2026-82853 — Nodemailer before 8.0.5 SMTP Command Injection via CRLF
• CVE-2026-82661 — Nodemailer CRLF Injection via List-* Header Comments

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