Vulnerability identifier: #VU27686

Vulnerability risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-3283

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to a communication error between internal functions in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) handler. A remote attacker can send a specially crafted SSL/TLS message, trigger memory corruption and cause a denial of service condition on the target system.

Note: This vulnerability affects Cisco Firepower Threat Defense (FTD) Software when running on the Cisco Firepower 1000 Series platform.

Mitigation
Vendor recommends to update the Cisco FTD Software to version 6.4.0.9 (May 2020), 6.5.0.5 (future release).

Vulnerable software versions

Cisco Firepower Threat Defense (FTD): 6.1.0, 6.2.2, 6.2.3, 6.3.0, 6.4.0

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-dos-4v5nmWtZ

---

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.