Denial of service in Red Hat OpenShift Service on AWS (ROSA)

Published: 2022-01-24
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-34558
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
rosa (Red Hat package)
Operating systems & Components / Operating system package or component

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Certificate Validation

EUVDB-ID: #VU55665

Risk: Medium


CVE-ID: CVE-2021-34558

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: Yes


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

The vulnerability exists due to improper certificate verification in crypto/tls package in Go when processing X.509 certificates. The application does not properly assert that the type of public key in an X.509 certificate matches the expected type when doing a RSA based key exchange, allowing a malicious TLS server to cause a TLS client to panic.


Install updates from vendor's website.

Vulnerable software versions

rosa (Red Hat package): before 1.1.1-51c4a5e.el8

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?