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HIGH · 8.6

CVE-2021-34783

A vulnerability in the software-based SSL/TLS message handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote att...

Vulnerability Description

A vulnerability in the software-based SSL/TLS message handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient validation of SSL/TLS messages when the device performs software-based SSL/TLS decryption. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: Datagram TLS (DTLS) messages cannot be used to exploit this vulnerability.

CVSS Score

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
CiscoFirepower Threat Defense>= 6.4.0, < 6.4.0.13
CiscoAdaptive Security Appliance Software>= 9.8.0, < 9.8.4.40
CiscoAsa 5512-X Firmware009.016\(001\)
CiscoAsa 5512-X-
CiscoAsa 5505 Firmware009.016\(001\)
CiscoAsa 5505-
CiscoAsa 5515-X Firmware009.016\(001\)
CiscoAsa 5515-X-
CiscoAsa 5525-X Firmware009.016\(001\)
CiscoAsa 5525-X-
CiscoAsa 5545-X Firmware009.016\(001\)
CiscoAsa 5545-X-
CiscoAsa 5555-X Firmware009.016\(001\)
CiscoAsa 5555-X-
CiscoAsa 5580 Firmware009.016\(001\)
CiscoAsa 5580-
CiscoAsa 5585-X Firmware009.016\(001\)
CiscoAsa 5585-X-

Related Weaknesses (CWE)

CWE-20CWE-119

References

FAQ

What is CVE-2021-34783?

CVE-2021-34783 is a vulnerability with a CVSS score of 8.6 (HIGH). A vulnerability in the software-based SSL/TLS message handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote att...

How severe is CVE-2021-34783?

CVE-2021-34783 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-34783?

Check the references section above for vendor advisories and patch information. Affected products include: Cisco Firepower Threat Defense, Cisco Adaptive Security Appliance Software, Cisco Asa 5512-X Firmware, Cisco Asa 5512-X, Cisco Asa 5505 Firmware.