Vulnerability identifier: #VU60166

Vulnerability risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-4160

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description

The vulnerability allows a remote attacker to decrypt TLS traffic.

The vulnerability exists due to BN_mod_exp may produce incorrect results on MIPS. A remote attacker can decrypt TLS traffic. According to vendor, multiple EC algorithms are affected, including some of the TLS 1.3 default curves. 

Successful exploitation of the vulnerability requires certain pre-requisites for attack, such as obtaining and  reusing private keys. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 3.0.0, 1.1.1 - 1.1.1l, 1.1.0 - 1.1.0l, 1.0.2 - 1.0.2za

---

External links
http://www.openssl.org/news/secadv/20220128.txt

---

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.