CVE-2021-34749
CVSS V2 Medium 5
CVSS V3 High 8.6
Description
A vulnerability in Server Name Identification (SNI) request filtering of Cisco Web Security Appliance (WSA), Cisco Firepower Threat Defense (FTD), and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from a compromised host. This vulnerability is due to inadequate filtering of the SSL handshake. An attacker could exploit this vulnerability by using data from the SSL client hello packet to communicate with an external server. A successful exploit could allow the attacker to execute a command-and-control attack on a compromised host and perform additional data exfiltration attacks.
Overview
- CVE ID
- CVE-2021-34749
- Assigner
- ykramarz@cisco.com
- Vulnerability Status
- Modified
- Published Version
- 2021-08-18T20:15:07
- Last Modified Date
- 2023-02-19T04:15:12
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:cisco:firepower_management_center:2.9.18:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:a:cisco:ironport_web_security_appliance:14.5:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:6.6.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:6.7.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:7.0.0:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:7.1.0:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:N/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 5
- Severity
- MEDIUM
- Exploitability Score
- 10
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- CHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 8.6
- Base Severity
- HIGH
- Exploitability Score
- 3.9
- Impact Score
- 4
References
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-34749 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34749 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:56:00 | Added to TrackCVE | |||
| 2022-12-05 08:33:21 | psirt@cisco.com | ykramarz@cisco.com | CVE Assigner | updated |
| 2022-12-05 08:33:21 | 2021-08-18T20:15Z | 2021-08-18T20:15:07 | CVE Published Date | updated |
| 2022-12-05 08:33:21 | 2021-08-25T19:11:04 | CVE Modified Date | updated | |
| 2022-12-05 08:33:21 | Analyzed | Vulnerability Status | updated | |
| 2023-02-11 03:14:01 | 2023-02-11T02:20:43 | CVE Modified Date | updated | |
| 2023-02-11 03:14:01 | Analyzed | Modified | Vulnerability Status | updated |
| 2023-02-11 03:14:01 | References | updated | ||
| 2023-02-19 05:12:58 | 2023-02-19T04:15:12 | CVE Modified Date | updated | |
| 2023-02-19 05:12:58 | References | updated |