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[email protected]CVE-2021-34793

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

CVE-2021-34793

2021-10-2719:15:08

CWE-924

[email protected]

web.nvd.nist.gov

cisco

asa

ftd

vulnerability

tcp normalizer

denial of service

dos

nvd

cve-2021-34793

8.6 High

CVSS3

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

8.3 High

AI Score

Confidence

High

5 Medium

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

0.001 Low

EPSS

Percentile

49.9%

JSON

A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software operating in transparent mode could allow an unauthenticated, remote attacker to poison MAC address tables, resulting in a denial of service (DoS) vulnerability. This vulnerability is due to incorrect handling of certain TCP segments when the affected device is operating in transparent mode. An attacker could exploit this vulnerability by sending a crafted TCP segment through an affected device. A successful exploit could allow the attacker to poison the MAC address tables in adjacent devices, resulting in network disruption.

Affected configurations

NVD

Node

ciscoadaptive_security_applianceRange<9.8.4.40

ciscofirepower_threat_defenseRange<6.4.0.13

ciscofirepower_threat_defenseRange6.5.0–6.6.5

ciscofirepower_threat_defenseRange6.7.0–6.7.0.3

ciscoadaptive_security_appliance_softwareRange9.9.0–9.12.4.29

ciscoadaptive_security_appliance_softwareRange9.13.0–9.14.3.9

ciscoadaptive_security_appliance_softwareRange9.15.0–9.15.1.17

ciscoadaptive_security_appliance_softwareRange9.16.0–9.16.2.3

Node

ciscoasa_5512-xMatch-

AND

ciscoasa_5512-x_firmwareMatch009.008\(004.025\)

Node

ciscoasa_5505Match-

AND

ciscoasa_5505_firmwareMatch009.008\(004.025\)

Node

ciscoasa_5515-xMatch-

AND

ciscoasa_5515-x_firmwareMatch009.008\(004.025\)

Node

ciscoasa_5525-xMatch-

AND

ciscoasa_5525-x_firmwareMatch009.008\(004.025\)

Node

ciscoasa_5545-xMatch-

AND

ciscoasa_5545-x_firmwareMatch009.008\(004.025\)

Node

ciscoasa_5555-xMatch-

AND

ciscoasa_5555-x_firmwareMatch009.008\(004.025\)

Node

ciscoasa_5580Match-

AND

ciscoasa_5580_firmwareMatch009.008\(004.025\)

Node

ciscoasa_5585-xMatch-

AND

ciscoasa_5585-x_firmwareMatch009.008\(004.025\)

CPENameOperatorVersion
cisco:adaptive_security_appliancecisco adaptive security appliancelt9.8.4.40
cisco:firepower_threat_defensecisco firepower threat defenselt6.4.0.13
cisco:firepower_threat_defensecisco firepower threat defenselt6.6.5
cisco:firepower_threat_defensecisco firepower threat defenselt6.7.0.3
cisco:adaptive_security_appliance_softwarecisco adaptive security appliance softwarelt9.12.4.29
cisco:adaptive_security_appliance_softwarecisco adaptive security appliance softwarelt9.14.3.9
cisco:adaptive_security_appliance_softwarecisco adaptive security appliance softwarelt9.15.1.17
cisco:adaptive_security_appliance_softwarecisco adaptive security appliance softwarelt9.16.2.3

CPE	Name	Operator	Version
cisco:adaptive_security_appliance	cisco adaptive security appliance	lt	9.8.4.40
cisco:firepower_threat_defense	cisco firepower threat defense	lt	6.4.0.13
cisco:firepower_threat_defense	cisco firepower threat defense	lt	6.6.5
cisco:firepower_threat_defense	cisco firepower threat defense	lt	6.7.0.3
cisco:adaptive_security_appliance_software	cisco adaptive security appliance software	lt	9.12.4.29
cisco:adaptive_security_appliance_software	cisco adaptive security appliance software	lt	9.14.3.9
cisco:adaptive_security_appliance_software	cisco adaptive security appliance software	lt	9.15.1.17
cisco:adaptive_security_appliance_software	cisco adaptive security appliance software	lt	9.16.2.3

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-asa-ftd-dos-JxYWMJyL

8.6 High

CVSS3

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

8.3 High

AI Score

Confidence

High

5 Medium

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

0.001 Low

EPSS

Percentile

49.9%

JSON

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