|Number of vulnerabilities||1|
|CVE ID|| CVE-2021-3449
|CWE ID|| CWE-476
|Public exploit||Public exploit code for vulnerability #1 is available.|
Red Hat Enterprise Linux Server - TUS
Operating systems & Components / Operating system
|Vendor||Red Hat Inc.|
This security advisory describes one medium risk vulnerability.
CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C] [PCI]
Exploit availability: YesDescription
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.The vulnerability exists due to a NULL pointer dereference error when processing TLSv1.2 renegotiations. A remote attacker can send a maliciously crafted renegotiation ClientHello message, which omits the signature_algorithms extension but includes a signature_algorithms_cert extension, trigger a NULL pointer dereference error and crash the server. Mitigation
Install updates from vendor's website.
Red Hat Enterprise Linux Server - TUS: 8.2
openssl (Red Hat package): before 1.1.1c-18.el8_2CPE
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. However, proof of concept for this vulnerability is available.