6.8

CVE-2026-20248

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability

A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the TCP DNS response handler to unexpectedly restart, causing the device to reload.

This vulnerability is due to a logic error when parsing a DNS query and tracking the size of the incoming buffers. An attacker could exploit this vulnerability by formatting a crafted reply to a DNS query sent from the targeted device. A successful exploit could allow the attacker to cause the device to reload, causing a denial of service (DoS) condition.
Note: The attacker must be able to respond to DNS queries from the device, either by controlling the DNS service or through a machine-in-the-middle attack.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerCisco
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Produkt Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
Default Statusunknown
Version 9.16.1
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Version 9.16.1.28
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Version 9.16.2
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Version 9.16.2.3
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Version 9.16.2.7
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Version 9.16.2.11
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Version 9.16.2.13
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Version 9.16.2.14
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Version 9.16.3.3
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Version 9.16.3
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Version 9.16.3.14
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Version 9.18.1
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Version 9.16.3.15
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Version 9.18.1.3
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Version 9.18.2
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Version 9.16.3.19
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Version 9.16.3.23
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Version 9.18.2.5
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Version 9.16.4
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Version 9.18.2.7
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Version 9.19.1
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Version 9.16.4.9
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Version 9.18.2.8
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Version 9.16.4.14
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Version 9.18.3
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Version 9.19.1.5
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Version 9.16.4.18
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Version 9.19.1.9
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Version 9.18.3.39
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Version 9.16.4.19
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Version 9.19.1.12
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Version 9.18.3.46
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Version 9.16.4.27
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Version 9.19.1.18
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Version 9.18.3.53
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Version 9.18.3.55
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Version 9.16.4.38
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Version 9.16.4.39
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Version 9.18.3.56
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Version 9.20.1
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Version 9.16.4.42
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Version 9.19.1.22
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Version 9.18.4
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Version 9.20.1.5
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Version 9.19.1.24
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Version 9.16.4.48
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Version 9.20.2
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Version 9.19.1.27
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Version 9.16.4.55
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Version 9.20.2.10
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Version 9.16.4.57
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Version 9.19.1.28
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Version 9.20.2.22
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Version 9.16.4.62
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Version 9.18.4.34
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Version 9.20.3
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Version 9.16.4.67
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Version 9.16.4.70
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Version 9.18.4.40
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Version 9.23.1
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Version 9.22.1.1
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Version 9.16.4.71
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Version 9.20.3.4
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Version 9.18.4.47
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Version 9.20.3.7
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Version 9.19.1.37
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Version 9.16.4.76
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Version 9.19.1.38
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Version 9.18.4.50
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Version 9.22.1.3
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Version 9.20.3.10
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Version 9.22.1.2
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Version 9.18.4.52
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Version 9.20.3.13
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Version 9.22.1.6
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Version 9.18.4.53
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Version 9.16.4.82
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Version 9.22.2
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Version 9.20.3.16
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Version 9.19.1.42
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Version 9.18.4.57
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Version 9.16.4.84
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Version 9.23.1.3
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Version 9.20.3.20
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Version 9.22.2.4
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Version 9.23.1.7
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Version 9.20.4
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Version 9.22.2.9
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Version 9.23.1.13
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Version 9.20.4.7
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Version 9.22.2.13
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Version 9.18.4.66
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Version 9.20.4.10
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Version 9.23.1.19
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Version 9.16.4.85
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Version 9.22.2.14
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Version 9.18.4.67
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Version 9.24.1
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Version 9.18.4.68
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Version 9.23.1.22
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Version 9.20.4.14
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Version 9.22.2.20
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Version 9.18.4.71
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Version 9.20.4.19
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Version 9.23.1.26
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Version 9.16.4.89
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Version 9.22.2.32
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Version 9.18.4.76
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Version 9.22.3
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Version 9.24.1.5
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Version 9.20.4.22
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Version 9.24.1.9
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Version 9.20.4.28
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Version 9.22.3.5
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Version 9.16.4.92
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Version 9.18.4.135
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Version 9.23.1.195
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Version 9.20.4.30
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Version 9.24.1.155
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Version 9.23.1.32
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Version 9.24.1.11
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Version 9.20.4.34
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Version 9.18.4.82
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Version 9.20.4.235
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HerstellerCisco
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Produkt Cisco Secure Firewall Threat Defense (FTD) Software
Default Statusunknown
Version 7.0.0
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Version 7.0.0.1
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Version 7.0.1
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Version 7.0.1.1
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Version 7.0.2
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Version 7.2.0
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Version 7.0.2.1
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Version 7.0.3
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Version 7.2.0.1
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Version 7.0.4
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Version 7.2.1
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Version 7.0.5
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Version 7.3.0
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Version 7.3.1
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Version 7.0.6
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Version 7.2.5
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Version 7.2.4.1
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Version 7.3.1.1
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Version 7.4.0
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Version 7.0.6.1
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Version 7.2.5.1
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Version 7.4.1
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Version 7.2.6
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Version 7.0.6.2
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Version 7.4.1.1
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Version 7.2.7
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Version 7.2.5.2
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Version 7.3.1.2
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Version 7.2.8
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Version 7.6.0
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Version 7.4.2
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Version 7.2.8.1
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Version 7.0.6.3
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Version 7.4.2.1
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Version 7.2.9
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Version 7.0.7
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Version 7.7.0
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Version 7.4.2.2
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Version 7.2.10
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Version 7.6.1
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Version 7.4.2.3
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Version 7.0.8
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Version 7.7.10
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Version 7.0.8.1
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Version 7.6.2.1
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Version 7.7.10.1
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Version 7.4.3
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Version 7.6.4
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Version 10.0.0
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Version 7.4.4
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Version 7.0.9
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Version 7.2.11
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Version 7.4.7
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VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.34% 0.275
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Cisco PSIRT 6.8 2.2 4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-195 Signed to Unsigned Conversion Error

The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tcpdns-dos-p6dUnjr5