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 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 v3 7.5 HIGH
CVSS v2.0 7.8 HIGH

7.5^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

7.8^/10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:C

Exploitability : 10.0 / Impact : 6.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

References

Link	Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:cisco:firepower_threat_defense::::::::
	cpe:2.3:a:cisco:firepower_threat_defense::::::::
	cpe:2.3:a:cisco:firepower_threat_defense::::::::
	cpe:2.3:a:cisco:firepower_threat_defense::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::

Configuration 2 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001\):::::::*
	cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001.025\):::::::*

cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*

Configuration 3 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001\):::::::*
	cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001.025\):::::::*

cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*

Configuration 4 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001\):::::::*
	cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001.025\):::::::*

cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:*

Configuration 5 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5525-x_firmware:009.016\(001\):::::::*
	cpe:2.3:o:cisco:asa_5525-x_firmware:009.016\(001.025\):::::::*

cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:*

Configuration 6 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5545-x_firmware:009.016\(001\):::::::*
	cpe:2.3:o:cisco:asa_5545-x_firmware:009.016\(001.025\):::::::*

cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:*

Configuration 7 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5555-x_firmware:009.016\(001\):::::::*
	cpe:2.3:o:cisco:asa_5555-x_firmware:009.016\(001.025\):::::::*

cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:*

Configuration 8 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5580_firmware:009.016\(001\):::::::*
	cpe:2.3:o:cisco:asa_5580_firmware:009.016\(001.025\):::::::*

cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:*

Configuration 9 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5585-x_firmware:009.016\(001\):::::::*
	cpe:2.3:o:cisco:asa_5585-x_firmware:009.016\(001.025\):::::::*

cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:*

History

16 Aug 2023, 16:17

Type	Values Removed	Values Added
CPE	cpe:2.3:a:cisco:adaptive_security_appliance::::::::	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::

29 Oct 2021, 14:43

Type	Values Removed	Values Added
CWE		CWE-20
References	~~(CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M -~~	(CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M - Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : 7.8 v3 : 7.5
CPE		cpe:2.3:h:cisco:asa_5512-x:-:::::::* cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001\):::::::* cpe:2.3:o:cisco:asa_5585-x_firmware:009.016\(001.025\):::::::* cpe:2.3:h:cisco:asa_5505:-:::::::* cpe:2.3:a:cisco:adaptive_security_appliance:::::::: cpe:2.3:o:cisco:asa_5545-x_firmware:009.016\(001\):::::::* cpe:2.3:o:cisco:asa_5545-x_firmware:009.016\(001.025\):::::::* cpe:2.3:h:cisco:asa_5525-x:-:::::::* cpe:2.3:o:cisco:asa_5555-x_firmware:009.016\(001\):::::::* cpe:2.3:h:cisco:asa_5545-x:-:::::::* cpe:2.3:h:cisco:asa_5555-x:-:::::::* cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001.025\):::::::* cpe:2.3:o:cisco:asa_5555-x_firmware:009.016\(001.025\):::::::* cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001\):::::::* cpe:2.3:h:cisco:asa_5580:-:::::::* cpe:2.3:o:cisco:asa_5585-x_firmware:009.016\(001\):::::::* cpe:2.3:h:cisco:asa_5515-x:-:::::::* cpe:2.3:o:cisco:asa_5580_firmware:009.016\(001.025\):::::::* cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001.025\):::::::* cpe:2.3:o:cisco:asa_5525-x_firmware:009.016\(001.025\):::::::* cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001.025\):::::::* cpe:2.3:h:cisco:asa_5585-x:-:::::::* cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001\):::::::* cpe:2.3:o:cisco:asa_5525-x_firmware:009.016\(001\):::::::* cpe:2.3:o:cisco:asa_5580_firmware:009.016\(001\):::::::* cpe:2.3:a:cisco:firepower_threat_defense::::::::

27 Oct 2021, 20:15

Type	Values Removed	Values Added
Summary	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.	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.

27 Oct 2021, 19:35

Type	Values Removed	Values Added
New CVE

Information

Published : 2021-10-27 19:15

Updated : 2024-02-04 22:08

NVD link : CVE-2021-34783

Mitre link : CVE-2021-34783

CVE.ORG link : CVE-2021-34783

JSON object : View

Products Affected

cisco

asa_5512-x
asa_5545-x_firmware
asa_5580_firmware
asa_5525-x_firmware
asa_5555-x_firmware
asa_5512-x_firmware
asa_5585-x_firmware
asa_5525-x
asa_5505_firmware
asa_5505
asa_5585-x
asa_5545-x
asa_5555-x
asa_5580
asa_5515-x
asa_5515-x_firmware
adaptive_security_appliance_software
firepower_threat_defense

CWE

CWE-20

Improper Input Validation

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

7.5 /10

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

7.8 /10

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

JSON object

Attach tags to CVE-2021-34783

7.5^/10

7.8^/10

Attach tags to `CVE-2021-34783`