A vulnerability in the DNS application layer gateway (ALG) functionality that is used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability is due to a logic error that occurs when an affected device inspects certain TCP DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through the affected device that is performing NAT for DNS packets. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on the affected device. Note: This vulnerability can be exploited only by sending IPv4 TCP packets through an affected device. This vulnerability cannot be exploited by sending IPv6 traffic.
References
| Link | Resource |
|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-KU9Z8kFX | Vendor Advisory |
Configurations
Configuration 1 (hide)
| AND |
|
History
13 Oct 2022, 19:59
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:h:cisco:catalyst_8500:-:*:*:*:*:*:*:* cpe:2.3:o:cisco:ios_xe:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_8500-4qc:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1000-esp200-x:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:asr_1000-esp100-x:-:*:*:*:*:*:*:* |
|
| CWE | CWE-754 | |
| References | (CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-KU9Z8kFX - Vendor Advisory | |
| First Time |
Cisco ios Xe
Cisco asr 1000-esp100-x Cisco catalyst 8500-4qc Cisco Cisco catalyst 8500 Cisco asr 1000-esp200-x |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 8.6 |
10 Oct 2022, 21:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2022-10-10 21:15
Updated : 2023-12-10 14:35
NVD link : CVE-2022-20837
Mitre link : CVE-2022-20837
CVE.ORG link : CVE-2022-20837
JSON object : View
Products Affected
cisco
- asr_1000-esp100-x
- asr_1000-esp200-x
- ios_xe
- catalyst_8500-4qc
- catalyst_8500
CWE
CWE-754
Improper Check for Unusual or Exceptional Conditions