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CiscoCVE-2021-34783

HistoryOct 27, 2021 - 7:15 p.m.

CVE-2021-34783

2021-10-2719:15:08

CWE-119

CWE-20

cisco

web.nvd.nist.gov

cisco

asa

ftd

ssl

tls

vulnerability

dos

remote attacker

nvd

cve-2021-34783

CVSS2

7.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

CVSS3

8.6

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS

0.002

Percentile

52.8%

JSON

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.

Affected configurations

Nvd

Node

ciscofirepower_threat_defenseRange6.4.0–6.4.0.13

ciscofirepower_threat_defenseRange6.6.0–6.6.5

ciscofirepower_threat_defenseRange6.7.0–6.7.0.3

ciscofirepower_threat_defenseRange7.0.0–7.0.1

ciscoadaptive_security_appliance_softwareRange9.8.0–9.8.4.40

ciscoadaptive_security_appliance_softwareRange9.12.0–9.12.4.29

ciscoadaptive_security_appliance_softwareRange9.14.0–9.14.3.9

ciscoadaptive_security_appliance_softwareRange9.15.0–9.15.1.17

ciscoadaptive_security_appliance_softwareRange9.16.0–9.16.2

Node

ciscoasa_5512-x_firmwareMatch009.016\(001\)

ciscoasa_5512-x_firmwareMatch009.016\(001.025\)

AND

ciscoasa_5512-xMatch-

Node

ciscoasa_5505_firmwareMatch009.016\(001\)

ciscoasa_5505_firmwareMatch009.016\(001.025\)

AND

ciscoasa_5505Match-

Node

ciscoasa_5515-x_firmwareMatch009.016\(001\)

ciscoasa_5515-x_firmwareMatch009.016\(001.025\)

AND

ciscoasa_5515-xMatch-

Node

ciscoasa_5525-x_firmwareMatch009.016\(001\)

ciscoasa_5525-x_firmwareMatch009.016\(001.025\)

AND

ciscoasa_5525-xMatch-

Node

ciscoasa_5545-x_firmwareMatch009.016\(001\)

ciscoasa_5545-x_firmwareMatch009.016\(001.025\)

AND

ciscoasa_5545-xMatch-

Node

ciscoasa_5555-x_firmwareMatch009.016\(001\)

ciscoasa_5555-x_firmwareMatch009.016\(001.025\)

AND

ciscoasa_5555-xMatch-

Node

ciscoasa_5580_firmwareMatch009.016\(001\)

ciscoasa_5580_firmwareMatch009.016\(001.025\)

AND

ciscoasa_5580Match-

Node

ciscoasa_5585-x_firmwareMatch009.016\(001\)

ciscoasa_5585-x_firmwareMatch009.016\(001.025\)

AND

ciscoasa_5585-xMatch-

VendorProductVersionCPE
ciscofirepower_threat_defense*cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
ciscoadaptive_security_appliance_software*cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
ciscoasa_5512-x_firmware009.016(001)cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001\):*:*:*:*:*:*:*
ciscoasa_5512-x_firmware009.016(001.025)cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001.025\):*:*:*:*:*:*:*
ciscoasa_5512-x-cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*
ciscoasa_5505_firmware009.016(001)cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001\):*:*:*:*:*:*:*
ciscoasa_5505_firmware009.016(001.025)cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001.025\):*:*:*:*:*:*:*
ciscoasa_5505-cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*
ciscoasa_5515-x_firmware009.016(001)cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001\):*:*:*:*:*:*:*
ciscoasa_5515-x_firmware009.016(001.025)cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001.025\):*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cisco	firepower_threat_defense	*	cpe:2.3:a:cisco:firepower_threat_defense::::::::
cisco	adaptive_security_appliance_software	*	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::
cisco	asa_5512-x_firmware	009.016(001)	cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001\):::::::*
cisco	asa_5512-x_firmware	009.016(001.025)	cpe:2.3:o:cisco:asa_5512-x_firmware:009.016\(001.025\):::::::*
cisco	asa_5512-x	-	cpe:2.3:h:cisco:asa_5512-x:-:::::::*
cisco	asa_5505_firmware	009.016(001)	cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001\):::::::*
cisco	asa_5505_firmware	009.016(001.025)	cpe:2.3:o:cisco:asa_5505_firmware:009.016\(001.025\):::::::*
cisco	asa_5505	-	cpe:2.3:h:cisco:asa_5505:-:::::::*
cisco	asa_5515-x_firmware	009.016(001)	cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001\):::::::*
cisco	asa_5515-x_firmware	009.016(001.025)	cpe:2.3:o:cisco:asa_5515-x_firmware:009.016\(001.025\):::::::*

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CNA Affected

[
  {
    "product": "Cisco Adaptive Security Appliance (ASA) Software",
    "vendor": "Cisco",
    "versions": [
      {
        "status": "affected",
        "version": "n/a"
      }
    ]
  }
]

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-decrypt-dos-BMxYjm8M

CVSS2

7.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

CVSS3

8.6

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS

0.002

Percentile

52.8%

JSON

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