CVE-2025-52981 Junos OS: SRX Series: Sequence of specific PIM packets causes a flowd crash
An unauthenticated attacker can cause a denial of service on Juniper SRX firewalls by sending specific PIM packets that crash the flow processing daemon.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-52981?
CVE-2025-52981 is a high-severity denial of service vulnerability in Juniper Junos, published on 11 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on
SRX1600, SRX2300, SRX 4000 Series, and SRX5000 Series with SPC3
allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If a sequence of specific PIM packets is received, this will cause a flowd crash and restart.
This issue affects Junos OS:
* all versions before 21.2R3-S9, * 21.4 versions before 21.4R3-S11, * 22.2 versions before 22.2R3-S7, * 22.4 versions before 22.4R3-S6, * 23.2 versions before 23.2R2-S4, * 23.4 versions before 23.4R2-S4, * 24.2 versions before 24.2R2.
This is a similar, but different vulnerability than the issue reported as
CVE-2024-47503, published in JSA88133.
Weakness: CWE-754
Which versions are affected by CVE-2025-52981?
It affects 1 product.
Products include Juniper Junos.
How do I fix CVE-2025-52981?
No fix has been published for CVE-2025-52981 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-52981 being exploited?
There is no known exploitation of CVE-2025-52981 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos
- CVE-2023-36845 Juniper Junos OS EX Series and SRX Series PHP External Variable Modification
- CVE-2020-1631 Juniper Junos OS Path Traversal
- CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization
- CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function
- CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification
Sources
Also known as GHSA-j2f6-v4vj-2456.