THREATPORT/VULNERABILITY/CVE-2024-20337
HIGH SEVERITY

CVE-2024-20337

Secure Client vulnerability

CVSS
8.2
EPSS
29.9%
EPSS pct
98th
Exploited
No known
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.
Affected vendor
Cisco
Affected product
Secure Client
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Weakness type (CWE)
Published
2024-03-06

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to confidentiality, low impact to integrity.

Its EPSS score of 29.9% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2024-20337

  • Confirm whether Cisco Secure Client is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2024-20337.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2024-20337

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2024-20337 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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