This security bulletin contains one medium risk vulnerability.
CWE-667 - Improper Locking
Exploit availability: NoDescription
The vulnerability allows a remote attacker to perform a denial of service attack (DoS).
The vulnerability exists due to improper locking in the SIP ALG of Juniper Networks Junos OS on MX Series and SRX Series. An non-authenticated attacker can send specially crafted traffic to the system to cause a flowprocessing daemon (flowd) crash.Mitigation
Install updates from vendor's website.Vulnerable software versions
Juniper Junos OS: before 21.3R2, 21.3R1-S1, 21.1R2-S2, 20.4R3-S1, 21.4R1, 21.2R1-S2, 21.1R3, 21.2R2
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.