CVE-2021-34787

CVSS V2 Medium 4.3 CVSS V3 Medium 5.3
Description
A vulnerability in the identity-based firewall (IDFW) rule processing feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass security protections. This vulnerability is due to improper handling of network requests by affected devices configured to use object group search. An attacker could exploit this vulnerability by sending a specially crafted network request to an affected device. A successful exploit could allow the attacker to bypass access control list (ACL) rules on the device, bypass security protections, and send network traffic to unauthorized hosts.
Overview
  • CVE ID
  • CVE-2021-34787
  • Assigner
  • ykramarz@cisco.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-10-27T19:15:08
  • Last Modified Date
  • 2021-10-29T12:31:02
Weakness Enumerations
CWE URL
CWE-755 http://cwe.mitre.org/data/definitions/755.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* 1 OR 9.8.4.40
cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* 1 OR 9.9.0 9.12.4.25
cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* 1 OR 9.13.0 9.14.3.1
cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* 1 OR 9.15.0 9.15.1.17
cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* 1 OR 9.16.0 9.16.1.28
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* 1 OR 6.4.0.13
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* 1 OR 6.5.0 6.6.5
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* 1 OR 6.7.0 6.7.0.3
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* 1 OR 7.0.0 7.0.1
AND
cpe:2.3:o:cisco:asa_5512-x_firmware:009.009:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:asa_5512-x_firmware:009.012:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:asa_5505_firmware:009.009:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:asa_5505_firmware:009.012:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:asa_5515-x_firmware:009.009:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:asa_5515-x_firmware:009.012:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:asa_5525-x_firmware:009.009:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:asa_5525-x_firmware:009.012:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:asa_5545-x_firmware:009.009:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:asa_5545-x_firmware:009.012:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:asa_5555-x_firmware:009.009:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:asa_5555-x_firmware:009.012:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:asa_5580_firmware:009.009:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:asa_5580_firmware:009.012:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:cisco:asa_5585-x_firmware:009.009:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:cisco:asa_5585-x_firmware:009.012:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:* 0 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:M/Au:N/C:N/I:P/A:N
  • Access Vector
  • NETWORK
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • PARTIAL
  • Availability Impact
  • NONE
  • Base Score
  • 4.3
  • Severity
  • MEDIUM
  • Exploitability Score
  • 8.6
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • NONE
  • Base Score
  • 5.3
  • Base Severity
  • MEDIUM
  • Exploitability Score
  • 3.9
  • Impact Score
  • 1.4
References
Reference URL Reference Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY Vendor Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-34787
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34787
History
Created Old Value New Value Data Type Notes
2022-05-10 06:49:10 Added to TrackCVE
2022-12-05 13:21:46 psirt@cisco.com ykramarz@cisco.com CVE Assigner updated
2022-12-05 13:21:46 2021-10-27T19:15Z 2021-10-27T19:15:08 CVE Published Date updated
2022-12-05 13:21:46 2021-10-29T12:31:02 CVE Modified Date updated
2022-12-05 13:21:46 Analyzed Vulnerability Status updated