Denial of service in Cisco Email Security Appliance



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-20960
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Cisco AsyncOS for Cisco Email Security Appliance
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU68968

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-20960

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of certain TLS connections processed by the device. A remote attacker can cause the device to drop new TLS email messages that come from the associated email servers.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco AsyncOS for Cisco Email Security Appliance: before 14.2.1-015

CPE2.3 External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-dos-gdghHmbV
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwc35162


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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