Home/CVE/A vulnerability in the memory management of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defens
CVE

CVE-2021-34792

A vulnerability in the memory management of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defens

A vulnerability in the memory management of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management when connection rates are high. An attacker could exploit this vulnerability by opening a significant number of connections on an affected device.

A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

HIGH · CVSS 8.6 EPSS 0.00431
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-400Uncontrolled Resource Consumption
CWE-401Missing Release of Memory after Effective Lifetime
▤

Affected Products & Versions

17
cisco firepower threat defense>= 6.4.0 and < 6.4.0.13
cisco firepower threat defense>= 6.6.0 and < 6.6.5
cisco firepower threat defense>= 6.7.0 and < 6.7.0.3
cisco firepower threat defense>= 7.0.0 and < 7.0.1
cisco adaptive security appliance software>= 9.8.0 and < 9.8.4.40
cisco adaptive security appliance software>= 9.12.0 and < 9.12.4.29
cisco adaptive security appliance software>= 9.14.0 and < 9.14.3.9
cisco adaptive security appliance software>= 9.15.0 and < 9.15.1.17
▣

Scoring & Timeline

8.6
HIGH · CVSS v3.1 · psirt@cisco.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Oct 2021 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisco-csafcisco-sa-asa-ftd-dos-Unk689XY
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-Unk689XYVendor Advisory
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