Access of Uninitialized Pointer in Junos OS Evolved - CVE-2021-0209
Published: January 15, 2021
Vulnerability identifier: #VU49555
CSH Severity: Medium
CVSS v4: 7.1 [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]
CVE-ID: CVE-2021-0209
CWE-ID: CWE-824
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Junos OS Evolved
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.
Junos OS Evolved - addressed in versions 19.4R2-S2-EVO, 20.1R1-S2-EVO, 20.1R2-S1-EVO, 20.2R1-EVO