Access of Uninitialized Pointer in Junos OS Evolved - CVE-2021-0209

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Main Vulnerability Database Vulnerabilities #VU49555

Access of Uninitialized Pointer in Junos OS Evolved - CVE-2021-0209

Published: January 15, 2021


Vulnerability identifier: #VU49555
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-0209
CWE-ID: CWE-824
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Junos OS Evolved

Detailed vulnerability description

The vulnerability allows a remote attacker to perform a DoS attack.

The vulnerability exists due to access to an uninitialized pointer in Regular expressions (REGEX) engine when processing valid BGP update packets from BGP peers. A remote attacker can certain valid BGP update packets and perform a denial of service (DoS) attack.


How to mitigate CVE-2021-0209

Install updates from vendor's website.

Juniper Networks Junos OS Evolved

  • 19.4 versions prior to 19.4R2-S2-EVO;
  • 20.1 versions prior to 20.1R1-S2-EVO, 20.1R2-S1-EVO.

Sources