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CVE-2024-20355

A vulnerability in the implementation of SAML 2.0 single sign-on (SSO) for remote access VPN services in Cisco Adaptive Security Appliance…

Medium5.0EPSS 0.33%
Published
Updated
Reserved
Assigned by
cisco

Description

A vulnerability in the implementation of SAML 2.0 single sign-on (SSO) for remote access VPN services in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to successfully establish a VPN session on an affected device. This vulnerability is due to improper separation of authorization domains when using SAML authentication. An attacker could exploit this vulnerability by using valid credentials to successfully authenticate using their designated connection profile (tunnel group), intercepting the SAML SSO token that is sent back from the Cisco ASA device, and then submitting the same SAML SSO token to a different tunnel group for authentication. A successful exploit could allow the attacker to establish a remote access VPN session using a connection profile that they are not authorized to use and connect to secured networks behind the affected device that they are not authorized to access. For successful exploitation, the attacker must have valid remote access VPN user credentials.

Timeline

  1. ID reserved

    By cisco

  2. · 7 months later

    Published

  3. · 2 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-2024-20355, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium5.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
NVDNVD · Analyzed3.1Medium5.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
EPSS (exploitation in 30 days)
0.33% · top 73% 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: Medium 5.0.

Weakness

Affected products

  • Cisco · Cisco Adaptive Security Appliance (ASA) Software

    • affected 9.8.2.28
    • affected 9.8.2.33
    • affected 9.8.2.35
    • affected 9.8.2.38
    • affected 9.8.3.8
    • affected 9.8.3.11
    • affected 9.8.3.14
    • affected 9.8.3.16
    • affected 9.8.3.18
    • affected 9.8.3.21
    • affected 9.8.3
    • affected 9.8.3.26
    • affected 9.8.3.29
    • affected 9.8.4
    • affected 9.8.4.3
    • affected 9.8.4.7
    • affected 9.8.4.8
    • affected 9.8.4.10
    • affected 9.8.4.12
    • affected 9.8.4.15
    • affected 9.8.4.17
    • affected 9.8.4.25
    • affected 9.8.4.20
    • affected 9.8.4.22
    • affected 9.8.4.26
    • affected 9.8.4.29
    • affected 9.8.4.32
    • affected 9.8.4.33
    • affected 9.8.4.34
    • affected 9.8.4.35
    • affected 9.8.4.39
    • affected 9.8.4.40
    • affected 9.8.4.41
    • affected 9.8.4.43
    • affected 9.8.4.44
    • affected 9.8.4.45
    • affected 9.8.4.46
    • affected 9.8.4.48
    • affected 9.12.1
    • affected 9.12.1.2
    • and 113 more

  • Cisco · Cisco Firepower Threat Defense Software

    • affected 6.2.3
    • affected 6.2.3.1
    • affected 6.2.3.2
    • affected 6.2.3.3
    • affected 6.2.3.4
    • affected 6.2.3.5
    • affected 6.2.3.6
    • affected 6.2.3.7
    • affected 6.2.3.8
    • affected 6.2.3.10
    • affected 6.2.3.11
    • affected 6.2.3.9
    • affected 6.2.3.12
    • affected 6.2.3.13
    • affected 6.2.3.14
    • affected 6.2.3.15
    • affected 6.2.3.16
    • affected 6.2.3.17
    • affected 6.2.3.18
    • affected 6.6.0
    • affected 6.6.0.1
    • affected 6.6.1
    • affected 6.6.3
    • affected 6.6.4
    • affected 6.6.5
    • affected 6.6.5.1
    • affected 6.6.5.2
    • affected 6.6.7
    • affected 6.6.7.1
    • affected 6.6.7.2
    • affected 6.4.0
    • affected 6.4.0.1
    • affected 6.4.0.3
    • affected 6.4.0.2
    • affected 6.4.0.4
    • affected 6.4.0.5
    • affected 6.4.0.6
    • affected 6.4.0.7
    • affected 6.4.0.8
    • affected 6.4.0.9
    • and 34 more

What to do

Exploitation: The Cisco Product Security Incident Response Team (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.

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Record last updated .