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CVE-2026-20105

A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure…

Description

A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker with a valid VPN connection to exhaust device memory resulting in a denial of service (DoS) condition.This does not affect the management or MUS interfaces. This vulnerability is due to trusting user input without validation. An attacker could exploit this vulnerability by sending crafted packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Timeline

  1. ID reserved

    By cisco

  2. · 5 months later

    Published

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-2026-20105, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Analyzed3.1High7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.36% · top 70% of all CVEs (9 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.7.

Affected products

  • Cisco · Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

    • affected 9.12.1
    • affected 9.12.1.2
    • affected 9.12.1.3
    • affected 9.12.2
    • affected 9.12.2.4
    • affected 9.12.2.5
    • affected 9.12.2.9
    • affected 9.12.3
    • affected 9.12.3.2
    • affected 9.12.3.7
    • affected 9.12.4
    • affected 9.12.3.12
    • affected 9.12.3.9
    • affected 9.12.2.1
    • affected 9.12.4.2
    • affected 9.12.4.4
    • affected 9.12.4.7
    • affected 9.12.4.10
    • affected 9.12.4.13
    • affected 9.12.4.8
    • affected 9.12.4.18
    • affected 9.12.4.24
    • affected 9.12.4.26
    • affected 9.12.4.29
    • affected 9.12.4.30
    • affected 9.12.4.35
    • affected 9.12.4.37
    • affected 9.12.4.38
    • affected 9.12.4.39
    • affected 9.12.4.40
    • affected 9.12.4.41
    • affected 9.12.4.47
    • affected 9.12.4.48
    • affected 9.12.4.50
    • affected 9.12.4.52
    • affected 9.12.4.54
    • affected 9.12.4.55
    • affected 9.12.4.56
    • affected 9.12.4.58
    • affected 9.12.4.62
    • and 107 more

  • Cisco · Cisco Secure Firewall Threat Defense (FTD) Software

    • 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
    • affected 6.4.0.10
    • affected 6.4.0.11
    • affected 6.4.0.12
    • affected 6.4.0.13
    • affected 6.4.0.14
    • affected 6.4.0.15
    • affected 6.4.0.16
    • affected 6.4.0.17
    • affected 6.4.0.18
    • affected 7.0.0
    • affected 7.0.0.1
    • affected 7.0.1
    • affected 7.0.1.1
    • affected 7.0.2
    • affected 7.0.2.1
    • affected 7.0.3
    • affected 7.0.4
    • affected 7.0.5
    • affected 7.0.6
    • affected 7.0.6.1
    • affected 7.0.6.2
    • affected 7.0.6.3
    • affected 7.0.7
    • affected 7.0.8
    • affected 7.0.8.1
    • affected 7.1.0
    • affected 7.1.0.1
    • affected 7.1.0.2
    • affected 7.1.0.3
    • affected 7.2.0
    • and 35 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

1

Sources

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

Badge for a README or a ticket

CVE-2026-20105 badge
[![CVE-2026-20105](https://cveledger.app/badge/CVE-2026-20105.svg)](https://cveledger.app/cve/CVE-2026-20105)

Record last updated .