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CVE-2024-20299Cisco Adaptive Security Appliance and Firepower Threat Defense AnyConnect Access Control List Bypass Vulnerability

Description

A vulnerability in the AnyConnect firewall for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured access control list (ACL) and allow traffic that should have been denied to flow through an affected device. This vulnerability is due to a logic error in populating group ACLs when an AnyConnect client establishes a new session toward an affected device. An attacker could exploit this vulnerability by establishing an AnyConnect connection to the affected device. A successful exploit could allow the attacker to bypass configured ACL rules.

Timeline

  1. ID reserved

    By cisco

  2. · 12 months later

    Published

  3. · 1 day 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-2024-20299, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Medium5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
NVDNVD · Analyzed3.1Medium5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
EPSS (exploitation in 30 days)
0.48% · top 58% of all CVEs (15 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.

Affected products

  • Cisco · Cisco Adaptive Security Appliance (ASA) Software

    • affected 9.12.3
    • affected 9.8.3
    • affected 9.12.1
    • affected 9.8.1
    • affected 9.12.2
    • affected 9.8.2.45
    • affected 9.8.2
    • affected 9.8.4
    • affected 9.14.1
    • affected 9.12.4
    • affected 9.8.2.26
    • affected 9.8.2.24
    • affected 9.8.2.15
    • affected 9.8.2.14
    • affected 9.8.2.35
    • affected 9.8.2.20
    • affected 9.8.2.8
    • affected 9.8.2.17
    • affected 9.8.2.28
    • affected 9.8.2.33
    • affected 9.8.2.38
    • affected 9.8.4.25
    • affected 9.12.3.2
    • affected 9.12.3.7
    • affected 9.8.3.18
    • affected 9.8.3.14
    • affected 9.8.4.15
    • affected 9.8.4.8
    • affected 9.8.1.7
    • affected 9.8.3.29
    • affected 9.14.1.10
    • affected 9.12.2.5
    • affected 9.8.4.22
    • affected 9.12.3.12
    • affected 9.8.4.7
    • affected 9.8.4.17
    • affected 9.8.3.16
    • affected 9.8.4.20
    • affected 9.8.3.11
    • affected 9.12.1.3
    • and 112 more

  • Cisco · Cisco Firepower Threat Defense Software

    • affected 6.2.3.14
    • affected 6.4.0.1
    • affected 6.2.3.7
    • affected 6.2.3
    • affected 6.4.0.2
    • affected 6.2.3.9
    • affected 6.2.3.1
    • affected 6.2.3.2
    • affected 6.4.0.5
    • affected 6.2.3.10
    • affected 6.4.0
    • affected 6.4.0.3
    • affected 6.2.3.6
    • affected 6.4.0.4
    • affected 6.2.3.15
    • affected 6.2.3.5
    • affected 6.2.3.4
    • affected 6.2.3.3
    • affected 6.2.3.8
    • affected 6.4.0.6
    • affected 6.2.3.11
    • affected 6.2.3.12
    • affected 6.2.3.13
    • affected 6.4.0.7
    • affected 6.4.0.8
    • affected 6.6.0
    • affected 6.4.0.9
    • affected 6.2.3.16
    • affected 6.6.0.1
    • affected 6.6.1
    • affected 6.4.0.10
    • affected 6.7.0
    • affected 6.4.0.11
    • affected 6.6.3
    • affected 6.7.0.1
    • affected 6.6.4
    • affected 6.4.0.12
    • affected 6.7.0.2
    • affected 7.0.0
    • affected 6.2.3.17
    • and 33 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 vulnerabilities that are described in this advisory.

References

References3

Sources

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

Badge for a README or a ticket

CVE-2024-20299 badge
[![CVE-2024-20299](https://cveledger.app/badge/CVE-2024-20299.svg)](https://cveledger.app/cve/CVE-2024-20299)

Record last updated .