#VU25478 Resource exhaustion in Cisco AsyncOS for Cisco Email Security Appliance - CVE-2020-3132

Vulnerability identifier: #VU25478

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-3132

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco AsyncOS for Cisco Email Security Appliance
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to inadequate parsing mechanisms for specific email body components in the email message scanning feature. A remote attacker can send a malicious email containing a high number of shortened URLs through an affected device, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco AsyncOS for Cisco Email Security Appliance: before 12.5.1 037

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-shrt-dos-wM54R8qA

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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