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CVE-2024-20337

A vulnerability in the SAML authentication process of Cisco Secure Client could allow an unauthenticated, remote attacker to conduct a…

High8.2EPSS 29.9%
Published
Updated
Reserved
Assigned by
cisco

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.

Timeline

  1. ID reserved

    By cisco

  2. · 4 months later

    Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-20337, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
NVDNVD · Analyzed3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
EPSS (exploitation in 30 days)
29.9% · top 1.8% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.

Weakness

Affected products

  • Cisco · Cisco Secure Client

    • affected 4.9.00086
    • affected 4.9.01095
    • affected 4.9.02028
    • affected 4.9.03047
    • affected 4.9.03049
    • affected 4.9.04043
    • affected 4.9.04053
    • affected 4.9.05042
    • affected 4.9.06037
    • affected 4.10.00093
    • affected 4.10.01075
    • affected 4.10.02086
    • affected 4.10.03104
    • affected 4.10.04065
    • affected 4.10.04071
    • affected 4.10.05085
    • affected 4.10.05095
    • affected 4.10.05111
    • affected 4.10.06079
    • affected 4.10.06090
    • affected 4.10.07061
    • affected 4.10.07062
    • affected 4.10.07073
    • affected 5.0.00238
    • affected 5.0.00529
    • affected 5.0.00556
    • affected 5.0.01242
    • affected 5.0.02075
    • affected 5.0.03072
    • affected 5.0.03076
    • affected 5.0.04032
    • affected 5.0.05040
    • affected 5.1.0.136
    • affected 5.1.1.42

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated .