Junos OS (SRX firewalls)
CVE-2025-52982: MX Series: When specific SIP packets are processed the MS-MPC will crash
An Improper Resource Shutdown or Release vulnerability in the SIP ALG of Juniper Networks Junos OS on MX Series with MS-MPC allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Junos OS (MX Series) 0 | 21.2R3-S9 or later |
| Junos OS (MX Series) 21.4 | 21.4* or later |
| Junos OS (MX Series) 22.2 | 22.2R3-S6 or later |
| Junos OS (MX Series) 22.4 | 22.4R3-S6 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Improper Resource Shutdown or Release vulnerability in the SIP ALG of Juniper Networks Junos OS on MX Series with MS-MPC allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
When an MX Series device with an MS-MPC is configured with two or more service sets which are both processing SIP calls, a specific sequence of call events will lead to a crash and restart of the MS-MPC. This issue affects Junos OS:
- all versions before 21.2R3-S9,
- 21.4 versions from 21.4R1,
- 22.2 versions before 22.2R3-S6,
- 22.4 versions before 22.4R3-S6.
As the MS-MPC is EoL after Junos OS 22.4, later versions are not affected.
This issue does not affect MX-SPC3 or SRX Series devices.
Am I affected?
To be affected by this issue two or more service sets need to be present:
[ services service-set <set1> ... ] [ services service-set <set2> ... ]
Workarounds
There are no known workarounds for this issue.
To reduce the risk of exploitation customers not requiring the SIP ALG functionality could explicitly disable it (in case it's by default enabled) by configuring:
[ security alg sip disable ]
Exploitation
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.